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b = -2
a² + 2ab + b²
(5)² + 2(5)(-2) + (-2)²
25 + 2(-10) + 4
25 - 20 + 4
5 + 4
9
a²b - ab² + a²b²
(5)²(-2) - (5)(-2)² + (5)²(-2)²
(25)(-2) - (5)(2) + (25)(4)
- 50 - 10 + 100
- 60 + 100
40