Mathematics, 31.08.2019 03:40 jamiesong3501

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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