hazaelvalenzuela234 hazaelvalenzuela234 26-10-2020 Mathematics contestada Simplify: 9-4x + 2x² + 8x' +1+ 6x2 A 4x + 3x² +15 B 4x3 + 8x2 + 10 C 5x + 8x2 +9 D 5x + 10x² + 7