Simplify- a-2 b-3 c2-a-2 b-3 c2-6 b2-9 b c

(a+2b+3c)2 (a 2b 3c)2 6b2 9bc = (a+2b+3c+a 2b 3c)(a+2b+3c a+2b+6c) 3b(2b+3c) x^2 y^2 = (x+y)(x y) ; Here, x = a+2b+3c and y = ...

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(x±a)(x±b) = x²±(a+b)x+ab.

Simplify: a+2...

Question

Simplify: (a+2b+3c)² - (a-2b-3c)²- 6b²- 9bc

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