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Let $f(x) = x^3 + 3x ^2 + 4x - 7$ and $g(x) = -7x^4 + 5x^3 +x^2 - 7$. What is the coefficient of $x^3$ in the sum $f(x) + g(x)$?

 May 14, 2021
edited by Guest  May 14, 2021
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(1) x^3    + 5x^3   =   6 x3

 May 14, 2021

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