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$-2(x^7 - x^4 + 3x^2 - 5) + 4(x^3 + 2x) - 3(x^5 - 4) = -2x^7 - 3x^5 + 2x^4 + 4x^3 - 6x^2 + 8x - 2$.

 

The sum of the coefficients is then (-2) + (-3) + 2 + 4 - 6 + 8 - 2 = 1.

 Aug 23, 2021

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