(6a+5b+4c)^2-(6a-5b-4c)^2
simplify
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Answer:
(6a+5b+4c)²-(6a-5b-4c)²
=(6a)²+(5b)²+(4c)²+2.6a.5b+2.5b.4c+2.4c.6a-{(6a)²+(5b)²+(4c)²-2.6a.5b+2.5b.4c-2.4c.6a}
=36a²+25b²+16c²+60ab+40bc+48ca-36a²-25b²-16c²+60ab-40bc+48ca
=120ab+96ca
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