Question

-X²+7x-5=0 formula general por fas

Answer 1

-X²+7x-5=0

Formula general:
$x_{1,\:2}=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$

Donde:
a=-1
b=7
c=-5

Por lo tanto:
$x_{1,\:2}=\frac{-7\pm \sqrt{7^2-4\left(-1\right)\left(-5\right)}}{2\left(-1\right)}$

$x_{1,\:2}=\frac{-7\pm\sqrt{29}}{-2}$

$x_{1,\:2}=\frac{7\pm \sqrt{29}}{2}$

$x_{1} =\frac{7-\sqrt{29}}{2},\: x_{2} =\frac{7+\sqrt{29}}{2}$