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OpenStudy (anonymous):
Which of the following shows that polynomials are closed under addition when two polynomials 4x2 − 8x − 7 and −5x + 16 are added? 4x2 − 13x + 9 may or may not be a polynomial 4x2 + 13x − 23 may or may not be a polynomial 4x2 − 13x + 9 will be a polynomial 4x2 + 13x − 23 will be a polynomial
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