Question

3 x elevado a 2 + 5 x = - x - 9 + 2 x elevado a 2

Answer 1

3x² + 5x = - x - 9 + 2x²
3x² - 2x² + 5x + x + 9 = 0
x² + 6x + 9 = 0
Fatorando:
(x + 3)(x + 3) = 0

x + 3 = 0 =>> x' = x'' = - 3


S = { - 3 }