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


Răspuns :

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