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25 May, 15:08

Is (5x+4) a factor of (-21x^2-15-40x+5x^3

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  1. 25 May, 18:37
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    No. It is not.

    Step-by-step explanation:

    Dividing 5x³+21x²-40x-15 by 5x+4 gives x²+5x-4 with a remainder. Which means, 5x+4 is not a factor of 5x³+21x²-40x-15
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