Answer:

[(a)^2 + (2b)^2 - 2(a)(2b)] - (3c)^2 [ 4ab = 2(a)(2b) ]

● [(a)^2 + (2b)^2 - 2(a)(2b)] = ( a - 2b )^2 # (A - B)^2 = A^2 + B^2 - 2AB ( IDENTITY )

= ( a - 2b )^2 - (3c)^2

= ( a - 2b + 3c ) ( a - 2b -3c ) = ANSWER # (A^2 - B^2) = (A + B)(A - B)

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HOPE IT HELPS

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