Factor 64-81z^2

Math
64-81z2
Rewrite 64 as 82.
82-81z2
Rewrite 81z2 as (9z)2.
82-(9z)2
Since both terms are perfect squares, factor using the difference of squares formula, a2-b2=(a+b)(a-b) where a=8 and b=9z.
(8+9z)(8-(9z))
Multiply 9 by -1.
(8+9z)(8-9z)
Factor 64-81z^2

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