mac2193 mac2193 12-10-2022 Mathematics Answered help pass due asap!!! Add (7x³ - 2x² - 5x+6) and (2x³ + 3x² − x − 1) a) 9x³ + x² - 6x +5 b) 9x6 + x4 + 5x² − 6 c) 9x³x² - 6x + 5 d) 14x³ - 6x² – 5x - 6