mabryh mabryh 11-05-2020 Mathematics contestada need help asap (6x4 + 9x3 + 5x - 6) + (2x4 + 3x3 - 2x - 5) = _________________ a. 8x3 + 6x2 - 3x - 11 b. 8x3 + 6x2 - 7x + 1 c. 8x4 + 12x3 + 3x - 11 d. 7x8 + 12x6 + 3x2 - 11