Exercise 2 Page 122

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.

x	- x-1	g(x)
-4	-( -4)-1	3
0	- 0-1	-1
3	- 3-1	-4