Question

x(в квадрате)-3x-4=0

Answer 1

D = 9 + 16 = 25 = $5^{2}$

$x1 = \frac{3+5}{2} = \frac{8}{2} = 4$

$x2 = \frac{3-5}{2} = \frac{-2}{2} = -1$