document.write( "Question 593796: use the difference of squares rule to factor the following expression:
\n" ); document.write( "64z^4-81a^4 \n" ); document.write( "

Algebra.Com's Answer #376465 by nerdybill(7384) $\"\"$ $\"About$

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64z^4-81a^4
\n" ); document.write( "can be written as:
\n" ); document.write( "(8z^2)^2 - (9a^2)^2
\n" ); document.write( "the above is a \"difference of squares\" which factors as:
\n" ); document.write( "(8z^2 - 9a^2)(8z^2 + 9a^2) \n" ); document.write( "

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