Question

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

Answer 1

`x=(7)/(2)\pm(√(29))/(2)`

Explanation:

`-x^2+7x=5`

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

`x=(-b\pm√(b^2-4ac))/(2a)`

`x=(-7\pm√(7^2-4(-1)(-5)))/(2(-1))`

`x=(-7\pm√(49-20))/(-2)`

`x=(-7\pm√(29))/(-2)`

`x=(7)/(2)\pm(√(29))/(2)`