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Big Ideas Math Integrated I, 2016

BI

Big Ideas Math Integrated I, 2016 View details

3. Function Notation

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Exercise 8 Page 125

To evaluate a function for a given value of the variable, substitute the value for the variable.

19, 18, and 15.5

Practice makes perfect

To evaluate a function for a certain value of x means that we substitute the given value for every instance of x. Let's do this for the given function when x=-2.

b(x)=18-0.5x

x= -2

b( -2)=18-0.5( -2)

MultNegNegOnePar

- a(- b)=a* b

b(-2)=18+0.5 * 2

Multiply

b(-2)=18+1

Add terms

b(-2)=19

When x=-2, the function's value is 19. We will evaluate this function for x=0 and x=5 in the same way using the table below.

x	18-0.5x	b(x)
-2	18-0.5( -2)	19
0	18-0.5( 0)	18
5	18-0.5( 5)	15.5

Subchapter links

Communicate Your Answer p.121

Monitoring Progress p.122-124

Exercises p.125-126