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### Transcript of ational 4XDOLÛFDWLRQV 2018

NationalQualications2018 H

Total marks — 60

Attempt ALL questions.

You may NOT use a calculator.

Full credit will be given only to solutions which contain appropriate working.

Write your answers clearly in the spaces provided in the answer booklet. The size of the space provided for an answer should not be taken as an indication of how much to write. It is not necessary to use all the space.

Additional space for answers is provided at the end of the answer booklet. If you use this space you must clearly identify the question number you are attempting.

Use blue or black ink.

Before leaving the examination room you must give your answer booklet to the Invigilator; if you do not, you may lose all the marks for this paper.

X747/76/11 MathematicsPaper 1 (Non-Calculator)

THURSDAY, 3 MAY

9:00 AM – 10:10 AM

A/PB

page 02

FORMULAE LIST

Circle:

The equation 2 2 2 2 0x y gx fy c+ + + + = represents a circle centre (−g, −f ) and radius 2 2g f c+ − .

The equation ( ) ( )2 2 2x a y b r− + − = represents a circle centre (a, b) and radius r.

Scalar Product: cos , where is the angle between and θ θ=a.b a b a b

or 1 1

1 1 2 2 3 3 2 2

3 3

where and .a b

a b a b a b a ba b

⎛ ⎞ ⎛ ⎞⎜ ⎟ ⎜ ⎟= + + = =⎜ ⎟ ⎜ ⎟⎜ ⎟ ⎜ ⎟⎝ ⎠ ⎝ ⎠

a.b a b

Trigonometric formulae:

sin (A B) sin A cos B cos A sin B± = ±

cos (A B) cos A cos B sin A sin B± = ∓

sin A sin A cos A2 2=

cos A cos A sin A2 22 = −

cos A22 1= −

sin A21 2= −

Table of standard derivatives:( )f x ( )f x′

sin ax

cosax

cosa ax

sina ax−

Table of standard integrals:( )f x ( )f x dx∫

sin ax

cosax

cos1 ax ca

− +

sin1 ax ca

+

page 03

MARKSAttempt ALL questions

Total marks — 60

1. PQR is a triangle with vertices P (−2, 4), Q (4, 0) and R (3, 6).

R (3, 6)

P (−2, 4)

Q (4, 0)

Find the equation of the median through R.

2. A function ( )g x is defined on , the set of real numbers, by

( )g x x= −14

5.

Find the inverse function, ( )g x−1 .

3. Given ( ) cosh x x= 3 2 , find the value of πh ⎛ ⎞′⎜ ⎟

⎝ ⎠6.

[Turn over

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MARKS

4. The point K (8, −5) lies on the circle with equation x y x y+ − − − =2 2 12 6 23 0.

K (8, −5)

x y x y+ − − − =2 2 12 6 23 0

Find the equation of the tangent to the circle at K.

5. A (−3, 4, −7), B (5, t, 5) and C (7, 9, 8) are collinear.

(a) State the ratio in which B divides AC.

(b) State the value of t.

6. Find the value of log log−5 5

1250 8

3.

4

1

1

3

page 05

MARKS

7. The curve with equation y x x x= − + +3 23 2 5 is shown on the diagram.

y

P

Q

O x

y x x x= − + +3 23 2 5

(a) Write down the coordinates of P, the point where the curve crosses the y-axis .

(b) Determine the equation of the tangent to the curve at P.

(c) Find the coordinates of Q, the point where this tangent meets the curve again.

8. A line has equation y x− + =3 5 0.

Determine the angle this line makes with the positive direction of the x-axis.

[Turn over

1

3

4

2

page 06

MARKS 9. The diagram shows a triangular prism ABC,DEF.

AB = t, AC = u and AD = v.

B

D F

CuA

t M

v

E

(a) Express BC in terms of u and t.

M is the midpoint of BC.

(b) Express MD in terms of t, u and v.

10. Given that

• dy x xdx

= − +26 3 4, and

• y = 14 when x = 2,

express y in terms of x.

1

2

4

page 07

MARKS

11. The diagram shows the curve with equation logy x= 3 .

y

x1O

(3,1)

logy x= 3

(a) On the diagram in your answer booklet, sketch the curve with equation logy x= − 31 .

(b) Determine the exact value of the x-coordinate of the point of intersection of the two curves.

12. Vectors a and b are such that = − +a i j k4 2 2 and p= − + +b i j k2 .

(a) Express 2a + b in component form.

(b) Hence find the values of p for which + =a b2 7.

[Turn over for next question

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3

1

3

page 08

MARKS

13. The right-angled triangle in the diagram is such that sin x = 2

11 and x π< <0

4.

2

x

11

(a) Find the exact value of:

(i) sin 2x

(ii) cos 2x.

(b) By expressing sin 3x as ( )sin x x+2 , find the exact value of sin 3x.

14. Evaluate ( )

dxx

−+

⌠⎮⌡

9

23

4

1

2 9.

15. A cubic function, f, is defined on the set of real numbers.

• ( )x + 4 is a factor of ( )f x

• x = 2 is a repeated root of ( )f x

• ( )f −′ =2 0

• ( )f x′ > 0 where the graph with equation ( )y f x= crosses the y-axis

Sketch a possible graph of ( )y f x= on the diagram in your answer booklet.

[END OF QUESTION PAPER]

3

1

3

5

4

Write your answers clearly in the spaces provided in this booklet. The size of the space provided for an answer should not be taken as an indication of how much to write. It is not necessary to use all the space.

Additional space for answers is provided at the end of this booklet. If you use this space you must clearly identify the question number you are attempting.

Use blue or black ink.

Before leaving the examination room you must give this booklet to the Invigilator; if you do not, you may lose all the marks for this paper.

FOR OFFICIAL USE

X747/76/01 Mathematics Paper 1 (Non-Calculator)Answer Booklet

Fill in these boxes and read what is printed below.

Full name of centre Town

Forename(s) Surname Number of seat

Day Month Year Scottish candidate number

*X7477601*

Mark

Date of birth

H NationalQualications2018

THURSDAY, 3 MAY

9:00 AM – 10:10 AM

A/PB

*X747760102*page 02

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THIS MARGIN

QUESTIONNUMBER

1.

2.

*X747760103*page 03

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3.

4.

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5.(a)

6.

5.(b)

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7.(a)

7.(c)

7.(b)

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8.

9.(a)

9.(b)

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10.

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QUESTIONNUMBER

11.(a)

11.(b)

An additional diagram, if required, can be found on page 13.

y

x1O

(3,1)

logy x= 3

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12.(a)

12.(b)

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13.(a)(i)

13.(a)(ii)

13.(b)

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14.

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QUESTIONNUMBER

15.

–6 –5 –4 –3 –2 –1 O 1 2 3 4 5 6

An additional diagram, if required, can be found on page 14.

x

y

*X747760113*page 13

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y

x1O

(3,1)

logy x= 3

*X747760114*page 14

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–6 –5 –4 –3 –2 –1 O 1 2 3 4 5 6 x

y

*X747760115*page 15

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For Marker’s Use

NationalQualications2018 H

Total marks — 70

Attempt ALL questions.

You may use a calculator.

Full credit will be given only to solutions which contain appropriate working.

Write your answers clearly in the spaces provided in the answer booklet. The size of the space provided for an answer should not be taken as an indication of how much to write. It is not necessary to use all the space.

Additional space for answers is provided at the end of the answer booklet. If you use this space you must clearly identify the question number you are attempting.

Use blue or black ink.

Before leaving the examination room you must give your answer booklet to the Invigilator; if you do not, you may lose all the marks for this paper.

X747/76/12 MathematicsPaper 2

THURSDAY, 3 MAY

10:30 AM – 12:00 NOON

A/PB

page 02

FORMULAE LIST

Circle:

The equation 2 2 2 2 0x y gx fy c+ + + + = represents a circle centre (−g, −f ) and radius 2 2g f c+ − .

The equation ( ) ( )2 2 2x a y b r− + − = represents a circle centre (a, b) and radius r.

Scalar Product: cos , where is the angle between and θ θ=a.b a b a b

or 1 1

1 1 2 2 3 3 2 2

3 3

where and .a b

a b a b a b a ba b

⎛ ⎞ ⎛ ⎞⎜ ⎟ ⎜ ⎟= + + = =⎜ ⎟ ⎜ ⎟⎜ ⎟ ⎜ ⎟⎝ ⎠ ⎝ ⎠

a.b a b

Trigonometric formulae:

sin (A B) sin A cos B cos A sin B± = ±

cos (A B) cos A cos B sin A sin B± = ∓

sin A sin A cos A2 2=

cos A cos A sin A2 22 = −

cos A22 1= −

sin A21 2= −

Table of standard derivatives:( )f x ( )f x′

sin ax

cosax

cosa ax

sina ax−

Table of standard integrals:( )f x ( )f x dx∫

sin ax

cosax

cos1 ax ca

− +

sin1 ax ca

+

page 03

MARKSAttempt ALL questions

Total marks — 70

1. The diagram shows the curve with equation y x x= + − 23 2 .

y

y = 3 + 2 x − x2

xO 3−1

2. Vectors u and v are defined by

−⎛ ⎞⎜ ⎟= ⎜ ⎟⎜ ⎟−⎝ ⎠

1

4

3

u and

−⎛ ⎞⎜ ⎟= ⎜ ⎟⎜ ⎟⎝ ⎠

7

8

5

v .

(a) Find u.v.

(b) Calculate the acute angle between u and v.

3. A function, f , is defined on the set of real numbers by ( )f x x x= − −3 7 6 .

Determine whether f is increasing or decreasing when x = 2 .

4. Express 23 6 7x x− − + in the form ( )a x b c+ +2.

[Turn over

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MARKS 5. PQR is a triangle with P(3,4) and Q(9,−2).

R

P (3,4)

Q (9,−2)L1

(a) Find the equation of L1 , the perpendicular bisector of PQ.

The equation of L2 , the perpendicular bisector of PR is y x+ =3 25.

R

CP (3,4)

Q (9,−2)L1

L2

(b) Calculate the coordinates of C, the point of intersection of L1 and L2.

C is the centre of the circle which passes through the vertices of triangle PQR.

R

CP (3,4)

Q (9,−2)L1

L2

(c) Determine the equation of this circle.

3

2

2

page 05

MARKS

6. Functions, f and g, are given by ( ) cosf x x= +3 and ( )g x x= 2 , x∈ .

(a) Find expressions for

(i) ( )( )f g x and

(ii) ( )( )g f x .

(b) Determine the value(s) of x for which ( )( ) ( )( )f g x g f x= where x≤ < π0 2 .

7. (a) (i) Show that ( )x − 2 is a factor of x x x− − +3 22 3 3 2.

(ii) Hence, factorise x x x− − +3 22 3 3 2 fully.

The fifth term, u5 , of a sequence is u a= −5 2 3.

The terms of the sequence satisfy the recurrence relation n nu au+ = −1 1.

(b) Show that u a a a= − − −3 27 2 3 1.

For this sequence, it is known that

• u u=7 5

• a limit exists.

(c) (i) Determine the value of a.

(ii) Calculate the limit.

[Turn over

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page 06

MARKS

8. (a) Express cos sinx x−2 ° ° in the form ( )cosk x a− °, k a> < <0, 0 360.

(b) Hence, or otherwise, find

(i) the minimum value of cos sinx x−6 ° 3 ° and

(ii) the value of x for which it occurs where x≤ <0 360 .

9. A sector with a particular fixed area has radius x cm.

The perimeter, P cm, of the sector is given by

P xx

= + 1282 .

Find the minimum value of P.

10. The equation ( )x m x m+ − + =2 3 0 has two real and distinct roots.

Determine the range of values for m.

11. A supermarket has been investigating how long customers have to wait at the checkout.

During any half hour period, the percentage, P %, of customers who wait for less than t minutes, can be modelled by

( )ktP e= −100 1 , where k is a constant.

(a) If 50% of customers wait for less than 3 minutes, determine the value of k.

(b) Calculate the percentage of customers who wait for 5 minutes or longer.

4

1

2

6

4

4

2

page 07

MARKS

12. Circle C1 has equation ( ) ( )x y− + + =2 213 4 100.

Circle C2 has equation x y x y c+ + − + =2 2 14 22 0 .

P

C2

C1

(a) (i) Write down the coordinates of the centre of C1.

(ii) The centre of C1 lies on the circumference of C2.

Show that c = −455.

The line joining the centres of the circles intersects C1 at P.

(b) (i) Determine the ratio in which P divides the line joining the centres of the circles.

(ii) Hence, or otherwise, determine the coordinates of P.

P is the centre of a third circle, C3.

C2 touches C3 internally.

(c) Determine the equation of C3.

[END OF QUESTION PAPER]

1

1

2

2

1

page 08

[BLANK PAGE]

Write your answers clearly in the spaces provided in this booklet. The size of the space provided for an answer should not be taken as an indication of how much to write. It is not necessary to use all the space.

Additional space for answers is provided at the end of this booklet. If you use this space you must clearly identify the question number you are attempting.

Use blue or black ink.

Before leaving the examination room you must give this booklet to the Invigilator; if you do not, you may lose all the marks for this paper.

FOR OFFICIAL USE

Fill in these boxes and read what is printed below.

Full name of centre Town

Forename(s) Surname Number of seat

Day Month Year Scottish candidate number

*X7477602*

Mark

Date of birth

H NationalQualications2018

THURSDAY, 3 MAY

10:30 AM – 12:00 NOON

A/PB

*X747760202*page 02

[BLANK PAGE]

*X747760203*page 03

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