Question

cum se mai scrie x la 2 + 9x+20 si x la 2 +7x+10

Answer 1

$x^{2} +9x+20= x^{2} +4x+5x+20=x(x+4)+5(x+4)=$
=$(x+4)(x+5)$
$x^{2} +7x+10= x^{2} +2x+5x+10= x(x+2)+5(x+2)=$
$=(x+2)(x+5)$