Solving problems

Question

If f(x) = |2x-4|, then f(-2) is 8.

A) true

B) false

Answer 1

Taking the absolute vale (shown by |*******| ) means we evaluate whatever is inside the absolute value signs, then drop the sign of whatever that result is.

So:

If f(x) = |2x - 4| then

f(-2) = |2(-2) - 4|

f(-2) = |-4 - 4|

f(-2) = |-8|

f(-2) = 8

True

Answer 2

| 2(-2) - 4 | = | -4 -4 | = |-8| = 8