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= a²+a+5b-b²-6
= a.a + a.b + a.(-2) + (-b).a + (-b).b +
(-b).(-2) + 3.a + 3.b + 3.(-2)
= a² + ab - 2a - ab - b² + 2b + 3a + 3b
- 6
= a² + b² + ab - ab - 2a + 3a + 2b + 3b
- 6
= a² + b² + a + 5b - 6