Question

encontra a raiz de x2-6x+9=16

Answer 1

x² - 6x + 9 = 16
x² - 6x + 9 - 16 = 0
x² - 6x - 7 = 0
a = 1; b = - 6; c = - 7

Δ = b² - 4ac
Δ = (-6)² - 4.1.(-7)
Δ = 36 + 28
Δ = 64

x = - b +/- √Δ = - ( - 6) +/- √64
          2a                 2.1

x = 6 + 8 = 14/2 = 7
        2

x = 6 - 8 = -2/2 = - 1
        2

R.: x = 7 e x = - 1