- ( t⁶ + 9t⁵ + t³ + 4t² - 45t )
Hi there !
(5 - t - t⁴)(9t + t²) =
= 45t + 5t² - 9t² - t³ - 9t⁵ - t⁶
= 45t - 4t² - t³ - 9t⁵ - t⁶
= - ( t⁶ + 9t⁵ + t³ + 4t² - 45t )
Good luck !
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