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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 9 Page 125

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

11, 7, and -3

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.

v(x)=12-2x-5

x= -2

v( -2)=12-2( -2)-5

MultNegNegOnePar

- a(- b)=a* b

v(-2)=12+2 * 2-5

Multiply

v(-2)=12+4-5

Add and subtract terms

v(-2)=11

When x=-2, the function's value is 11. We will evaluate this function for x=0 and x=5 in the same way using the table below.

x	12-2x-5	v(x)
-2	12-2( -2)-5	11
0	12-2( 0)-5	7
5	12-2( 5)-5	-3

Subchapter links

Communicate Your Answer p.121

Monitoring Progress p.122-124

Exercises p.125-126