Question

use the quadratic formula to solve the equation -x2 + 7x = 5

Answer 1

Answer:

$x=\frac{7}{2}\pm\frac{\sqrt{29}}{2}$

Step-by-step explanation:

$-x^2+7x=5$

$-x^2+7x-5=0$

$x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$

$x=\frac{-7\pm\sqrt{7^2-4(-1)(-5)}}{2(-1)}$

$x=\frac{-7\pm\sqrt{49-20}}{-2}$

$x=\frac{-7\pm\sqrt{29}}{-2}$

$x=\frac{7}{2}\pm\frac{\sqrt{29}}{2}$