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= a pangkat 2 - 7a pangkat 2 + 2ab - 5ab - 3 b pangkat 2
= ( 1 - 7 ) a pangkat 2 + ( 2-5 ) ab - 3b pangkat 2
= -6a pangkat 2 + (- 3ab ) - 3 b pangkat 2
= -6a pangkat 2 - 3ab - 3b pangkat 2
= a² + 2ab -3b² -7a² -5ab
= a² -7a² -3b² +2ab -5ab
= -6a² -3b² -3ab