Question

descompuneti in factori:
a)(5a +7)totul la patrat-4b la patrat
b)9x la ptrat -(2y+1)totul la patrat
Varoogg am nevoie urgent
Dau coronita!!!!!

Answer 1

$a) (5a+7)^2-4b^2=[(5a+7)-2b][(5a+7)+2b]= \\\\ =(5a-2b+7)(5a+2b+7) \\\\\\ b)9x^2-(2y+1)^2=[3x-(2y+1)][3x+(2y+1)]= \\\\ =(3x-2y+1)(3x+2y+1)$