Question

(x + 9).(x – 2) + 4 = (x + 2)^2

Answer 1

Respuesta:

6

Explicación paso a paso:

$(x + 9)(x - 2) + 4 = {(x + 2)}^{2} \\ {x}^{2} + 7x - 18 + 4 = {x}^{2} + 4x + 4 \\ {x}^{2} + 7x - 14 = {x}^{2} + 4x + 4 \\ 7x - 4x = 4 + 14 \\ 3x = 18 \\ x = 6$