Question

How do I solve for x in:
y = -(x-4)^2 + 4

Answer 1

This is not calculus; it is algebra.

That can be rearranged to give you
(x-4)^2 = 4-y

Then take the square root of both sides and add 4.

x = sqrt(4-y)+4

Answer 2

lol yeah algebra, ok that's what I got, just making sure.