Question

hallar x : 2(x+3)(x+4) = (2x+5)(x-3)​

Answer 1

Explicación paso a paso:

$2(x + 3)(x + 4) = (2x + 5)(x - 3) \\2( {x}^{2} + 7x + 12) = 2 {x}^{2} - x - 15 \\ 2 {x}^{2} + 14x + 24 = 2 {x}^{2} - x - 15$

CANCELA EL 2X²

$14x + 24 = - x - 15 \\ 15x = - 39 \\ x = - \frac{ 39}{15} simplificas \\ x = - \frac{13}{5}$