Question

-3x^+6x+9=0 ajudem !!

Answer 1

-3x² + 6x + 9 = 0 (*-1)
3x² - 6x - 9 = 0
Delta = b² - 4ac
Delta = 36 - 4(3)(-9)
Delta = 36 + 108
Delta = 144
X = (-b +- raiz delta) / 2a
X = (6 +- 12) / 6
x' = (6 + 12) / 6 = 18/6 = 3
x" = (6 - 12) / 6 = -6/6 = -1