Question 183219
 (17:21:47): (3z^4 - 8)^2

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[17/(21/47)) / (3z^4 - 8)^2

= [(17*47)21] / (9z^8 - 2*8*3z^4 + 64)

= [38.048] / [9z^8 - 48z^4 + 64]

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Cheers,
Stan H.