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x la puterea 2 -14x+49​

Răspuns :

x²-14x+49=

x²-2×x×7+7²=

(x-7)²

x^2-14x+49

x^2-2•x•7+49 =>

folosim formula a^2-2ab+b^2=(a-b)^2 si DESCOMPUNEM expresia

(x-7)^2