nehemiahm25523 nehemiahm25523 09-04-2021 Mathematics contestada Which of the following expressions is equivalent to (12x4−4x3+7x+6)+(3x2−4x+14)? A 12x4−x3+3x+20 B 15x6−8x4+21x+6 C 15x6−4x3+3x+20 D 12x4−4x3+3x2+3x+20