Решите уравнение: 4x-4x^2=0. -x^2+9=0
1) 4x^2-4x = 0 4x(x-1)=0 x1=0 x2 = 1 2) x^2-9=0 (x-3)(x+3) = 0 x1 = 3 x2 = -3