TamraE127246 TamraE127246 28-10-2022 Mathematics contestada What is the sum of -2x³ + x-3 and x³-3x -4?(a) Show your work.(b) Is the sum of -2x³ + x-3 and x³ - 3x - 4 equal to the sum ofExplain your answer.x³ 3x4 and -2x³+x-3?