Question

rezolvati in r ecuatiile:a) x^2+4x-5=0; b)2x^2 -3x - 2=0

Answer 1

Răspuns:

a) x₁ = 1  ; x₂ = -5

b) $x_{1} = 2$  ; $x_{2} = -\frac{1}{2}$

Explicație pas cu pas:

a) x² + 4x - 5 = 0

Δ = 16 + 20 = 36

$x_{1} = \frac{-4+6}{2} = 1$

$x_{2} = \frac{-4-6}{2} = -5$

b) 2x² - 3x - 2 = 0

Δ = 9 + 16 = 25

$x_{1} = \frac{3 + 5}{4} = 2$

$x_{2} = \frac{3-5}{4} = -\frac{1}{2}$