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3a (3a-2b)+2b (3a-2b)
9a^2 - 6ab+6ab-4b^2
9a^2 - 4b^2
=3a²-6ab+6ab-4b²
=3a²-4b²
d.(2p+2)²=(2p)²+2(2p)(2)+(2)²
=4p²+8p+4²