Mathematics
Junior High
Resolved
このような感じで、{a+(b-c)}{a-(b-c)}が
a2乗-(b-c)2乗
になるのかがピンと来ないのですが、教えてほしいです。
お願いします
21 (1) (a+b-c)(a-b+c)
={a+(b-c)}{a-(b-c)}
=a2-(b-c)2
=a2-(b2-2bc+c2)
=a2-b2+2bc-c2
=a2-62-c2+2bc
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