Tìm x, a) x(x - 4) - (x^2 - 8) = 0

Bài 3: tìm x

a) x(x - 4) - (x^2 - 8) = 0

b) (x - 3)(x^2 + 3x + 9) - (3x - 17) = x^3 - 12