f(x) = -(x + 2)2 + 6

Answer 1

F(x) = -(x+2)^2 + 6
F(x) = -(x^2+4x+4) + 6
-x^2-4x-4 + 6 = 0.
-x^2 - 4x + 2 = 0.
Use quadratic formula.