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descompuneti in factori :X la a2 +8x+15

Răspuns :

x²+8x+15=x²+3x+5x+15=x(x+3)+5(x+3)=(x+3)(x+5)
[tex] x^{2} +8x+15= x^{2} +5x+3x+15=x(x+5)+3(x+5)[/tex][tex]=(x+3)(x+5)[/tex]
Succes.