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OpenStudy (anonymous):
what polynomial could you add to 3x^4 - 9x^3 + 5x^2 - x + 7 to get a sum of 3+4x^4 + 3x-x^3 + 3x^2
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OpenStudy (amoodarya):
(3+4x^4 + 3x-x^3 + 3x^2)-(3x^4 - 9x^3 + 5x^2 - x + 7)
OpenStudy (anonymous):
\[x ^{4}+8x ^{3}-2x ^{2}+4x-4\]
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