Question

Solve for x in the equation x2 + 4x-4-8.
x=-6 or x = 2
x=-2+2 V2
x=-2 or x = 6
x=2+2.3

Answer 1

You’ll get x = 2 or x = -6
( using the cross method / calculator )

Answer 2

x² + 4x - 4 - 8 = 0

x² + 4x - 12 = 0

x² + 6x - 2x - 12 = 0

x(x + 6) - 2(x + 6) = 0

(x - 2)(x + 6) = 0

x - 2 = 0 => x₁ = 2

x + 6 = 0 => x₂ = - 6