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Big Ideas Math Integrated I, 2016 View details

3. Function Notation

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Exercise 6 Page 125

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

-5, -7, and -12

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.

r(x)=- x-7

Substitute

x= -2

r( -2)=-( -2)-7

NegNeg

- (- a)=a

r(-2)=2-7

SubTerm

Subtract term

r(-2)=-5

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