Question

(X - 1) ( x - 2) - 12 =0

Answer 1

Resposta:

(X - 1) ( x - 2) - 12 =0

x² - 2x - x + 2 -12 = 0

x² - 3x - 10 = 0

a = 1      b = -3     c = -10

Δ = (-3)² -4 (1) (-10)

Δ = 9 + 40

Δ = 49

                         $x_{1}$ = $\frac{3+7}{2}$ = $\frac{10}{2}$ = 5

x = $\frac{-(-3)+-\sqrt{49} }{2.1}$ =

                         $x_{2}$ =  $\frac{3-7}{2}$ = $\frac{-4}{2}$ = -2

^^