Mathematics
Senior High
Resolved
写真の赤線の因数分解の仕方を教えてください。
α² + ß² + y² = (α+B+r) ² −2(aß+By+ra)=(-2)²-2-3=³-2
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x³ +ß³ +r³ = x³ + ß³ +r³ − 3aßr+3aßr
=(α+ß+r){x² + ß² + y² − (aß +By+7a)} +3aßr
=(-2)・{(-2)-3}+3・(-4)=−2,
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ありがとうございます!