Question

5(x-7)(x+18)
Найдите корни уравнения

Answer 1

$5х^2+90х-35х-630=0 \\ </p><p>5х^2+55х-630=0$

D=3025+12600=15625

$\sqrt{15625} = 125$

$x1 = \frac{ - 55 - 125}{10} = \frac{ - 180}{10} = - 18$

$x2 = - \frac{ - 55 + 125}{10} = \frac{70}{10} = 7$