Mathematics: Sum of two products is product

Friday, October 30, 2015

Sum of two products is product

Hello dear Kabu. Thank you for being among my best students. Here is another puzzle I made recently. Show why, for all numbers, A, B, C, that (A-B)(A+B) + (B-C)(B+C) = (A-C)(A+C). Sign in to see full entry.

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