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March 29, 2017

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how to factor

9x8-745x4+1296
by
9x4-16??

Thankyou!!

  • math - ,

    Online "^" is used to indicate an exponent.

    9x^8 - 745x^4 + 1296

    Find factors for 1296 (2 * 2 * 2 * 2 * 9 * 9)

    See how those can combine with factors of 9 from the first term to give the middle term.

    9x^8 - 745x^4 + 1296 = (9x^4 - 16)(x^4 - 81)

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