prove that ( A 2B ).(2A - 3B) = 2A2 AB - 6B2
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=A(2A-3B) + 2B(2A- 3B)
=2A^2 - 3AB + 4AB - 6B^2
= 2A^2 + AB - 6B^2
Hence proved
=2A^2 - 3AB + 4AB - 6B^2
= 2A^2 + AB - 6B^2
Hence proved
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