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OpenStudy (natsent06):
Add 4x^4 + 7x^3 + 15x^2 + 4 and 4x^3 + 2x^2 + 17x.
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hartnn (hartnn):
identify like terms like \(a x^3 and \\ -bx^3\) are like terms, because the exponent of x is same (here 3)
hartnn (hartnn):
then combine them \(ax^3 -bx^3 = (a-b)x^3\)
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