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= 6².(-1) + 2 (6) (-1) + (-1)²
= -36 - 12 + 1
= -47
b) a²b - ab² + a²b² =
= 6² (-1) - 6(-1)² + 6²(-1)²
= -36 - 6 + 36
= -42 + 36
= -6
c) 2a + 2a²b² + 3ab² + b³ =
= 2 (6) + 2 (6²) (-1²) + 3 (6) (-1)² + (-1)³
= 12 + 72 + 18 - 1
= 84 + 17
= 101