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Big Ideas Math Integrated I, 2016 View details

3. Function Notation

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Exercise 2 Page 122

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

3, -1, and -4

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=-4.

g(x)= - x-1

Substitute

x= -4

g( -4)=-( -4)-1

NegNeg

- (- a)=a

g(-4)=4-1

SubTerm

Subtract term

g(-4)=3

When x=-4, the function's value is 3. We will evaluate this function for x=0 and x=3 in the same way using the table below.