Question

x2 + 2x (x + 1) = 5
ajudem aii

Answer 1

Explicação passo-a-passo:

x² + 2x² + 2x = 5

3x² + 2x - 5=0

∆= 2² - 4 .3 .(-5)

∆= 4 + 60

∆= 64

x = - 2 ±√64/2.3

x= - 2 ± 8/6

x1 = -2 +8/6

x1= 6/6

x1 = 1

x2= -2-8/6

x2= - 10/6

x2= - 5/3

S = { -5/3, 1 }