desireewalsh desireewalsh 21-10-2022 Mathematics contestada Simplify the following expression. 2x+3x³-5x² + x² +7x+1+7x5-3x³-4 A. 9x - 4x +7x+5 B. 5x5 +5x² +7x-3 C. 9x5 +6x +7x+3 D. 9x - 4x² +7x-3