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OpenStudy (anonymous):
Add: x 5 - 4x 4 + 7x 3 + 8, 9x 3 + 7x 2 - 10, and -2x 5 + 7x 4 - 3x + 8.
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OpenStudy (ghostfire):
for those question, you need to add the one which has the same power together. i.e x^5+3x^5=4x^5
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