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cum descompun x la a doua-13x+40?

Răspuns :

x²-13x+40=x²-10x+25-3x+15=(x-5)²-3(x-5)=(x-5)(x-5-3)=(x-5)(x-8)
x la puterea 2-13x+40=x la puterea 2-10x+25-3x+15=(x-5) la puterea2 3(x-5)=(x-5)(x-5-3)=(x-5)(x-8)
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