SOLUTION: product of (3c-5d)(2c+4d)

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Question 417343: product of (3c-5d)(2c+4d)
Answer by ewatrrr(24785) About Me  (Show Source):
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Hi

product of 

 (3c-5d)(2c+4d)

  6c^2 + 2cd -20d^2

Note:SUM of the inner product(-10cd) and the outer product(12x) = 2x