Respuesta :

Hosein

[tex]x(6 + x) = 5 \times 8 \\ {x}^{2} + 6x - 40 = 0 \\ (x + 10)(x - 4) = 0 \\ x = 4[/tex]
[tex]4(x + 4) = 64 \\ x + 4 = 16 \\ x = 12[/tex]