Question

x + 5)(x-2)= ayuda ​

Answer 1

(x + 5)(x-2) Multiplicamos normalmente

$x^{2} -2x +5x - 10 = 0$

$x^{2} +3x-10 = 0$

Δ = $(3)^{2} - 4 (1) (-10) = 9 + 40 = 49$

x = $\frac{-3 +-\sqrt{49} }{2} =\frac{-3+-7}{2}$

Opción 1 = $\frac{-3 + 7}{2} =\frac{4}{2} = 2$

Opción 2 = $\frac{-3-7}{2} = \frac{-10}{2} = - 5$