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## Homework Statement

I want the surface area of Revolution about x from [-2,2] of y = |x|

So I want to know if I can take it x from [0,2] and just multiply this result by 2?

## Homework Equations

## The Attempt at a Solution

Set up

dy/dx = (5/(2√x))

S = 2 ∏ ∫ 5x^1/2(√ 1 +((5/(2√x))^2)

from x = 0 , to x = 2. Then multiply this result by 2? Is this OK to do?