breannahoward breannahoward 29-09-2021 Mathematics contestada Find the sum of the given polynomials. 3x2 + 2x - 5 and -4 + 7x2 10 x2 - 5 x - 1 - x2 + 9 x - 9 21 x2 + 2 x + 20 10 x2 + 2 x - 9
