Factor 9z^2-25y^2

Rewrite 9z2 as (3z)2.
Rewrite 25y2 as (5y)2.
Since both terms are perfect squares, factor using the difference of squares formula, a2-b2=(a+b)(a-b) where a=3z and b=5y.
Multiply 5 by -1.
Factor 9z^2-25y^2

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