Question

qual a raiz de ×2 -3×-4=0??

Answer 1

Resposta:

Raizes = -1 e 4

Explicação passo a passo:

delta = $b^{2}$ -4.a.c -->

delta = $(-3)^{2}$ - 4.1.(-4) -->

delta = 9 + 16 -->

delta = 25

x = -b +- $\sqrt{delta}$ / 2.a   -->  

x = -(-3) +- $\sqrt{25}$ / 2 . 1  -->

x = 3 +- 5 / 2

x1 =  $\frac{3 + 5}{2}$  -->   x1 = $\frac{8}{2}$   --> x1 = 4

x2 =  $\frac{3 - 5}{2}$  -->   x2 = $\frac{-2}{2}$   --> x2 = -1