Question

x(x+1)+x=8???????????????

Answer 1

x(x + 1) + x = 8

x² + x + x = 8
x² + 2x - 8 = 0

∆ = b² - 4ac
∆ = 2² - 4.1(-8)
∆ = 4 + 32
∆ = 36

x = -b±√∆/2a

x¹ = -2 + 6/2
x¹ = 4/2
x¹ = 2

x² = -2 - 6/2
x² = -8/2
x² = -4

S = {-4,2}