Question

решите уравнение:x^2-15=2x

Answer 1

$x {}^{2} - 2x - 15 = 0 \\ d = 4 + 60 = 64 \\ x1 = \frac{2 - 8}{2} = - 3 \\ x2 = \frac{2 + 8}{2} = 5$