Question

respondam rapido por favor galera​

Answer 1

$x = \dfrac{-b \pm \sqrt{b^2-4 \cdot a \cdot c}}{2 \cdot a}$

Sendo a = 1, b = 8 e c=15:

$x = \dfrac{-8 \pm \sqrt{8^2-4 \cdot 1 \cdot 15}}{2 \cdot 1}$

$x = \dfrac{-8 \pm \sqrt{64-60}}{2}$

$x = \dfrac{-8 \pm \sqrt{4}}{2}$

$x = \dfrac{-8 \pm 2}{2}$

$x_1 = \dfrac{-8 + 2}{2}$

$x_1 = -\dfrac{6}{2}$

$\boxed{x_1 = -3}$

$x_2 = \dfrac{-8 -2}{2}$

$x_2 = -\dfrac{10}{2}$

$\boxed{x_2= -5}$