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descompuneti in factori suma x patrat-10x+21

Răspuns :

EnglishzzBoi
[tex]x^2-10x+21 \\ =\left(x^2-3x\right)+\left(-7x+21\right) \\ =x\left(x-3\right)-7\left(x-3\right) \\ =\left(x-3\right)\left(x-7\right)[/tex]

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