Solve the following quadratic equations using the …...TASTER DAY 2017 lesson notes.notebook 1 July...

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TASTER DAY 2017 lesson notes.notebook 1 July 05, 2017 Jun 1609:59 Alevel Maths Taster Session Introduction to Alevel Maths So good choice, but only if you really enjoy doing Maths, as you will be spending a lot of time on it! Jun 1608:21 Solve the following quadratic equations using the methods given: Factorise Quadratic formula (leave in surd form) Complete the square (find exact solutions)

Transcript of Solve the following quadratic equations using the …...TASTER DAY 2017 lesson notes.notebook 1 July...

Page 1: Solve the following quadratic equations using the …...TASTER DAY 2017 lesson notes.notebook 1 July 05, 2017 Jun 16 09:59 A level Maths Taster Session Introduction to A level Maths

TASTER DAY 2017 ­ lesson notes.notebook

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July 05, 2017

Jun 16­09:59

A­level Maths Taster Session

Introduction to A­level Maths

So ­ good choice, but only if you really enjoy doing Maths, as you will be spending a lot of time on it!

Jun 16­08:21

Solve the following quadratic equations using the methods given:Factorise Quadratic formula

 (leave in surd form)

Complete the square

 (find exact solutions)

Page 2: Solve the following quadratic equations using the …...TASTER DAY 2017 lesson notes.notebook 1 July 05, 2017 Jun 16 09:59 A level Maths Taster Session Introduction to A level Maths

TASTER DAY 2017 ­ lesson notes.notebook

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July 05, 2017

Jun 16­08:28

The quadratic formula ­ proof:The formula is derived from the general quadratic equation, by completing the square.

Jun 16­08:28

How A­level maths works!4 lessons per week ­ a mixture of:

• Pure Maths topics

• Statistics

• Mechanics

Examined by:

3 x 2 hour papers at the end of Y13

1. Pure Maths topics only

2. Pure Maths and Mechanics

3. Pure Maths and Statistics

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July 05, 2017

Jun 25­15:22

A: Proof

B: Algebra and functions

C: Coordinate geometry in the (x,y) plane

D: Sequences and series

E: Trigonometry

F: Exponentials and logarithms

G: Differentiation

H: Integration

I: Numerical methods

J: Vectors

K: Statistical sampling

L: Data presentation and interpretation

M: Probability

N: Statistical distributions

O: Statistical hypothesis testing

P: Quantities and units in mechanics

Q: Kinematics

R: Forces and Newton’s laws

S: Moments

Jun 16­08:29

A new topic ­ LogarithmsInvestigate with your log button:

log10

log100

log1000

log1

log0.1

What theories do you have ­ can you make any predictions?

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July 05, 2017

Jun 16­09:19

What about...?log5

log50

log500

log4

log3

log2

What do you notice?

Jun 16­09:21

The notation 'log' is dedicated to base 10 logarithms and can also be written as log10

log1010 = 1

log10100 = 2

log101000 = 3

log100.1 = ­1

because...

Page 5: Solve the following quadratic equations using the …...TASTER DAY 2017 lesson notes.notebook 1 July 05, 2017 Jun 16 09:59 A level Maths Taster Session Introduction to A level Maths

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July 05, 2017

Jun 16­10:02

So, the logarithm (to base 10) of any number, is the power of ten needed to obtain that number.

This can be extended to other bases to give a general rule:

If 

thenlogaN = x

N = ax

'log to base a of N = x'

Here, a is still called the base

So x is the power of a needed in order to get N

Jun 16­10:13

So, to evaluate different logs, we can use this process:

1)  log24 2)  log381

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July 05, 2017

Jun 16­10:14

We can find x as the base:

logx125 = 3

Jun 16­10:15

Try these:

Write in the form y = ax

logmc = d logbp = q log s = t

Evaluate:log264 log464 log55 log21

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July 05, 2017

Jun 16­10:22

Solve:

logx8 = 3 logx16 = 0.5

Jun 16­10:01

So logarithms are powers...Just like the rules for powers/indices, there are a set of rules for logs, that allow us to manipulate expressions algebraically.

We have

logaa = 1 loga1 = 0Also (remember the base 10 logs)

1

2

3

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July 05, 2017

Jun 16­10:29

These rules allow us to combine, simplify and solve where necessary.

Eg: We know that log5 = 0.699  (3 sf)

So  log50 = 

Jun 16­10:41

Express as a single logarithm

7loga2 ­ 3loga12 + 5loga3

1

2

3

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July 05, 2017

Jun 16­10:43

Try these:

2loga5 loga15 - loga3 loga4 + loga3

2loga5 + loga4 - loga10

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2

3

Jun 16­11:05

2loga5 + loga4 - loga10

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July 05, 2017

Jun 16­10:47

And finally - try using the rules in reverse.

Express each of these in terms of log a, log b, log c

log(abc) log(a2bc) log(a√b)

Jun 25­15:47

Getting ready for September:

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July 05, 2017

Jun 25­16:20

Jun 25­16:21

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July 05, 2017

Jun 25­16:22

Jun 25­16:22

Good luck and welcome to A‐level maths!