Find $6 y^{5} - y^{4} + 4 y^{3} - 5 y^{2} - y - 15$ if $y = 3$

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Solution

$6 y^{5} - y^{4} + 4 y^{3} - 5 y^{2} - y - 15 y = 3 6 (3)^{5} - 3^{4} + 4 (3)^{3} - 5 (3)^{2} - 3 - 15 1458 - 81 + 108 - 45 - 3 - 15 = 1422$

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