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B) -15m³n² - (-2m³n²) = -15m³n² + 2m³n² = -13m³n²
C) 1°: 8m² + 5 + (-2 + 7m²) = 8m² + 5 - 2 + 7m²= 15m² + 3
2°: 20m - 8 + (-m² + 5m) = 20m - 8 - m² + 5m = 25m - 8 - m²
Finalmente: 15m² + 3 - ( 25m - 8 - m²)
15m² + 3 - 25m + 8 + m²
16m² + m² +11
¡¡Espero haber sido de ayuda!!