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Nu mai stiu cum se face:

Descompuneti in factori:

(3x+5)^2 - (x+1)^2


Răspuns :

9x²+30x+25-( x²+2x+1) = 9x²+30x+25-x²-2x-2=8x²+28x+24
(a+b)∧2=a∧2+2ab+b∧2
⇒9x∧2+30x+25-x∧2-2x-1
⇒8x∧2+28x+24