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-x² + 5xy dan 4x² - 4xy
= -x² + 5xy + 4x² - 4xy
= -x² + 4x² + 5xy - 4xy
= 3x² + xy
No. 2 :
4x² + 2x - 7 dari x² + 3x + 2
= x² + 3x + 2 - (4x² + 2x - 7)
= x² + 3x + 2 - 4x² - 2x + 7
= x² - 4x² + 3x - 2x + 2 + 7
= 3x² + x + 9