Question

Решите уравнение:
(x+3)(x-3) - x(x+4) =0

Answer 1

$(x + 3)(x - 3) - x(x + 4) = 0 \ {x}^{2} - 9 - {x}^{2} - 4 times x = 0 \ - 4x = 9 \ x = - 2 times frac{1}{4} \ x = - 2.25$