SOLUTION: use the difference of squares rule to factor the following expression: 64z^4-81a^4

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Question 593796: use the difference of squares rule to factor the following expression:
64z^4-81a^4
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
64z^4-81a^4
can be written as:
(8z^2)^2 - (9a^2)^2
the above is a "difference of squares" which factors as:
(8z^2 - 9a^2)(8z^2 + 9a^2)