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Stefanboss154
a fost răspuns

descompune ti in factor comun>>>(3x+1)la patrat-(x+3) la patrat

Răspuns :

Alitta
(3x+1)² - (x+3)² =      ...       ne folosim de formula ,, a²-b²=(a+b)(a-b) ,,
=[(3x+1)+(x+3)][(3x+1)-(x+3)]=
=(4x+4)(2x-2)=4*2*(x+1)(x-1)=8*(x+1)(x-1)

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