Factor 49s^2-64t^2

Rewrite 49s2 as (7s)2.
Rewrite 64t2 as (8t)2.
Since both terms are perfect squares, factor using the difference of squares formula, a2-b2=(a+b)(a-b) where a=7s and b=8t.
Multiply 8 by -1.
Factor 49s^2-64t^2

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