Find the value of b if one solution to the equation 2x^2-bx=b is x=-2

Answer 1

2x^2 -bx - b = 0

2(4) +2b -b = 0

b = -8

2x^2 +8x + 8 = 0

x^2 + 4x + 4 = 0

(x+2)^2 = 0

x +2 = 0

x = -2