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OpenStudy (anonymous):
(9x^3-5x^2+4x)+(5x^3+7x^2-13x)
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OpenStudy (gorv):
just add the coefficent having same power of x
OpenStudy (gorv):
like first x^3 have power three and coefficient 9 and 5 9+5=14 so 14 x^3 similarly others
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