Question

Descompuneți in factori: a) (3x+1)²-(x-3)²
b) (3x+5)²-(x+1)²

Answer 1

a) $(3x+1)^{2} - (x-3)^{2} =  =9 x^{2} +1+6x- x^{2} -9+6x =$
$=8 x^{2} +12x-8$
b) [tex] (3x+5)^{2} -( x+1)^{2} =
=9 x^{2} +25+30x- x^{2} -1-2x=[/tex]
$8 x^{2} +28x+24$