Question

resolva a equação (X-3)2 =9

Answer 1

(x - 3)² = 9

x² - 6x + 9 = 9
x² - 6x + 9 - 9 = 0
x² - 6x = 0

Δ = b² - 4ac
Δ = (-6)² - 4(1)(0)
Δ = 36

x = -b +- √Δ / 2a

x' = 6 + 6 / 2  = 12/2  = 6

x'' = 6 - 6 / 2 = 0/2  = 0


S = {0, 6}