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espero se entienda
xy = 5
Hallar:
M = (x + y)³ - 15(x + y) + 15
M = x³ + 3x²y + 3xy² + y³ - 15x - 15y + 15
M = 20 + 3xy(x + y) - 15(x + y) + 15
M = 35 + 3(5)(x + y) - 15(x + y)
M = 35 + 15(x + y) - 15(x + y)
M = 35