Question

If f(x) = |x + 7|, find f(–12).

Answer 1

All you have to do is plug the -12 in for x and solve like you would any other equation like that.

Answer 2

put x with -12 so it will be |-12+7|=|-5|=5

Answer 3

just substitute

f(-12) = |-12 +7|

with absolute value just find the convert your answer to the positive

Answer 4

just substitute to x=-12 into the equation. Anything within the 'bar' will become positive, so |-5|=5.

Answer 5

f(x) = |x + 7| means that f(x)=x+7, if x>=-7 and f(x)=-(x+7), if x<-7. Since -12<-7, f(x)=-x-7, so f(-12)=5.