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Big Ideas Math Integrated I, 2016 View details

3. Function Notation

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Exercise 4 Page 125

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

-6, 0, and 15

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.

g(x)=3x

Substitute

x= -2

g( -2)=3( -2)

MultPosNeg

a(- b)=- a * b

g(-2)=-3 * 2

Multiply

g(-2)=-6

When x=-2, the function's value is -6. We will evaluate this function for x=0 and x=5 in the same way using the table below.