Question

$2 x^{2} =90-7х$

Answer 1

2х² = 90 - 7х
2х² + 7х - 90 = 0
D = 7² + 4 * 2 * 90 = 769 > 0

$x_1= frac{-7- sqrt{769} }{4} \ \ x_2= frac{-7+ sqrt{769} }{4}$