Ответ:
1.(x+7)²-x(x+14)=x²+14x+49-x²-14x=49
2.b²+5-10(b-2)=b²+5-10b+20=b²-10b+25=(b-5)²
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Ответ:
1.(x+7)²-x(x+14)=x²+14x+49-x²-14x=49
2.b²+5-10(b-2)=b²+5-10b+20=b²-10b+25=(b-5)²