Question

equaçao de 2° grau 7x²+x=-2x²-11x-4

Answer 1

7x² + x =- 2x ²- 11x - 4
7x² + x + 2x² + 11x + 4 = 0
9x² + 12x + 4 = 0

∆ = b² - 4ac
∆ = 12² - 4.9.4
∆ = 144 - 144
∆ = 0

x = (-b ± √∆) / 2a
x = (-12 ± 0) / 2.9
x = -12 / 18
x = -2/3

S = {x e IR | x = -2/3}