(2a-3b-c) square expand
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Hope it helps
Also there are other identities
Also there are other identities
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(2a-3b-c)²
Using identity (a+b+c)²= a²+b²+c²+2ab+2bc+2ca
(2a)²+(-3b)²+(-c)²+2(2a)(-3b)+2(-3b)(-c)+2(-c)(2a)
4a²+9b²+c²-12ab+6bc-4ac
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