Question

Решите уравнение x(x-6)=40

Answer 1

x(x - 6) = 40
x^2 - 6x - 40 = 0
D = 36 + 4*40 = 196
x1 = (6 - 14)/2
 x1 = - 4
x2 = (6 + 14)/2
x2 = 10