Question

Achar as raizes reais da equação x2+2x-8=0

Answer 1

Resposta:

$2 {}^{2} - 4 \times 1 \times 8$

$4 - ( - 32) = 36$

$\frac{ - 2 \frac{ + }{ - } \sqrt{36} }{2 \times 1}$

$x1 = \frac{ - 2 + 6}{2 \times 1}$

$x1 = \frac{4}{2} = 2$

$x1 = 2$

$x2 = \frac{ - 2 - 6}{2 \times 1}$

$x2 = \frac{ - 8}{2} = - 4$

$x2 = - 4$