Question

Rezolvati ecuatia: 
(x+2)(x-3)-2(x+5)²= x(4-x), x∈ R.

Answer 1

Inmultim primele doua paranteze si ridicam la puterea a doua pe a treia paranteza.
$x^2-3x+2x-6-2(x^2+10x+25)=4x-x^2$

$x^2-x-6-2x^2-20x-50=4x-x^2$

$-25x=56$

$x=-\dfrac{56}{25}=-2,24$