Question

1)- qual e a raiz da equaçao: 4x + 56 = 2x + 196 ??

2)- determine as raizes da equaçao x² + 2x - 3 = 0 ??
Urgenteee

Answer 1

Resposta:

1) 70

2) x' = 1 x" = -3

Explicação passo a passo:

1) 4x + 56 = 2x + 196

4x - 2x = 196 - 56

2x = 140

x = $\frac{140}{2}$

x = 70

2) x² + 2x - 3 = 0

   b² - 4.a.c

2² - 4.1. (-3)

4 + 12

Δ = 16

x = $\frac{- b ± \sqrt{16} }{2a}$

x = $\frac{- 2± 4}{2}$

x' = -2 +4/ 2

x' = 1

x" = -2-4/2

x" = -3