SOLUTION: How do I factor this completely? y^4Z^4-81z^4 Thank you in advance!!!!1

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Question 87769: How do I factor this completely?
y^4Z^4-81z^4 Thank you in advance!!!!1
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
factor this completely?
y^4Z^4-81z^4
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= z^4(y^4 - 81)
= z^4(y^2+9)(y^2-9)
= z^4(y^2+9)(y+3)(y-3)
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Cheers,
Stan H.