Mathematics
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どうしてこのように絶対値の変形ができるのですか?
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d= PA-PB Va² +α= Jax-ay b+a +ay 1(2)-(91) a²+b² →絶対値って かけても よかったっけ?

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✨ Best Answer ✨

一般に|A| |B| = |AB|が成り立ちます

|bx-ay| |bx+ay|
= | (bx-ay)(bx+ay) |
= | (bx)²-(ay)² |
です

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