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Eric Parshall · Answer 1 · 2017-03-01T20:24:24+0000

64 m^2 - 9 n^2 -------(1)
first think about squares
what is 64 m^2 = ( 8m)^2
also what is 9n^2 = (3n)^2
so 64 m^2 - 9 n^2 = (8m)^2 - (3n)^2
= (8m -3n) (8m+3n) ------(2)
to check multiply (2) to get (1)

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