Math question. please help me?

Question

I need to evaluate the expression then find the range and domain....

f(x)=16/x(x-4) find f(-4) what would be the range of this and how would i find it?

Answer 1

you replace x with -4: like this.

f(x)=16/x(x-4)

f(-4)=16/-4(-4*-4)

f(-4)=16/-4(16)

f(-4)=16/-64

f(-4)=-1/4

your answer is -1/4