Question

equação de 2° grau
$\times {}^{2} - 7 \times - 10 = 0$
​

Answer 1

Explicação passo-a-passo:

$x^2-7x-10=0$

$x_{1,\:2}=\frac{-\left(-7\right)\pm \sqrt{\left(-7\right)^2-4\cdot \:1\cdot \left(-10\right)}}{2\cdot \:1}\\x_{1,\:2}=\frac{-\left(-7\right)\pm \sqrt{89}}{2\cdot \:1}\\x_1=\frac{-\left(-7\right)+\sqrt{89}}{2\cdot \:1},\:x_2=\frac{-\left(-7\right)-\sqrt{89}}{2\cdot \:1}\\x=\frac{7+\sqrt{89}}{2},\:x=\frac{7-\sqrt{89}}{2}$