Let’s see what you remember

Find the value of the following.

1. (3 – 8)2 × 4 – 3 2. 3 + (21 ÷ 7) × 8 ÷ 4

 

Evaluate each expression if a = 3, b = 7, and c = -2.

3. 4. (5a + 3b)2 – c2

 

Simplify each expression.

5. 3a + 5b + 7a – 3b 6. 3(5x + 6y) + 8(2x – y)

b

ca

3

35

Warm Up

Find the value of the following.

1. (3 – 8)2 × 4 – 3 2. 3 + (21 ÷ 7) × 8 ÷ 4

 

Evaluate each expression if a = 3, b = 7, and c = -2.

3. 4. (5a + 3b)2 – c2

 

Simplify each expression.

5. 3a + 5b + 7a – 3b 6. 3(5x + 6y) + 8(2x – y)

b

ca

3

35

97 9

12927

3

21

9

10a + 2b 31x + 10y

Math 4 day 1 agenda

Paper Cup Analysis Exploration 1-1a in small groups (15-20 minutes)

Issue textbooks while students complete explorations Issue course outline: State rules and expectations (10 minutes)Students will read pp. 1-5 after they finish the exploration PPT to match pp 1-5 in the text (10 minutes)Exploration 1-2a Names of Functions in small group as a review

of linear, quadratic, power, exponential, inverse, quartic, and rational functions (20 minutes)

Summary of exploration and vocabulary (15 mins)Assignment pg. 5 #’s 1-6 and finish exploration 1-2a

Standard(s):MA3A4. Students will investigate functions.

a. Compare and Contrast properties of functions within and across the following types: linear, quadratic, polynomial, power, rational, exponential, logarithmic, trigonometric, and piecewise.

Essential Question(s):How can I represent functions algebraically, graphically, numerically and verbally?

Exploration 1-1a SummaryHave one member from each group sketch their answer for #2 on the board and then write the groups answer for #5 on the board. Be prepared to discuss this exploration.

This section in your textbook reviews functions graphically, numerically, and algebraically. It begins by presenting a graph and equation for the relationship between coffee temperature and time. After you read pp. 1-5 be prepared to discuss the vocabulary: Function, Mathematical Model, Dependent Variable, Independent Variable, Domain, Range, Asymptote, Extrapolation, and Interpolation.

Relationship between coffee temperature and time

Verbally

Graphically

Algebraically

Numerically

When you pour a cup of coffee it begins at a temperature of 90 degrees Celsius, it cools more rapidly at first, then less rapidly, finally approaching the room temperature of 20 degrees Celsius.

xy )8.0(7020

x (min) y(oC)

0 90

5 42.9

10 27.5

15 22.5

20 20.8

Discuss/define:•Function •Mathematical Model• Dependent Variable •Independent Variable •Domain

•Range, •Asymptote•Extrapolation•Interpolation

1.2 Types of functionsNote- the notation f(x) represent substitution not multiplication.

A relation is a function when each value in the domain there is only one corresponding value in the domain.

Pay close attention to the difference between an exponential and a power function

Complete Exploration 1.2aNames of Functions

Graphing Calculators Allowed

Time allowed 15-20 minutesBegin CW/HW if you finish early

Assignment pg. 5 #’s 1-6.

SummaryEach group is assigned one problem to describe

to the class

Direct variation - special case of a linear function with y-intercept 0, power function with a power of 1, and polynomial function with only a linear term. In other words its graph is a straight line through the origin. Can you think of any from science?

An Inverse variation function is a power function with a negative exponent , and asymptotes at each axis. Can you think of any from science?

Hooke’s law y=kx or Newton’s second law of motion F=ma

Boyle’s law P= k/V

Restricted Domains and Boolean Variables

Assignment pg. 5 #’s 1-6 and finish exploration 1-2a

If you write a function where the dominator is the restriction you will only get the graph for the values where it is true and the restriction yields a 1, when it is not true it will yield a 0 and division by zeros is undefined so there will be no graph when the restriction is not true.

Example 1, in your book p. 11 will only graph for the values when 3< x< 10 if you let

y1 = 3x + 26 / (x > 3 and x < 10)

Note: the inequality signs are found under 2nd MATH Test #4 and #6 and the word “and” is found under 2nd MATH arrow over to logic #1, try graphing this. Make sure your window for the y values will show the answer 56

A Boolean variable is a variable that has a given condition attached to it. If the condition is true, the variable equals 1, if the condition is false the variable equals 0.

To plot a function is a restricted domain, divide by any one term of the function’s equation by the appropriate Boolean variable.