Perform the operation indicated, then place the answer in the proper location on the grid. Write your answer in descending powers of m.
a) -5m³ + 20m²n² - 3mn³
b) -5m³ - 20m²n² + 3mn³
c) -5m³ - 20m²n² - 3mn³
d) -5m³ + 20m²n² + 3mn³

Respuesta :