12x² + 15xy - 7y² + 18 - (5x² - 12xy - 6y² + 20)
= 12x² + 15xy - 7y² + 18 - 5x² + 12xy + 6y² - 20
= 12x² - 5x² + 15xy + 12xy - 7y² + 6y² + 18 - 20
= 7x² + 27xy - y² - 2
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12x² + 15xy - 7y² + 18 - (5x² - 12xy - 6y² + 20)
= 12x² + 15xy - 7y² + 18 - 5x² + 12xy + 6y² - 20
= 12x² - 5x² + 15xy + 12xy - 7y² + 6y² + 18 - 20
= 7x² + 27xy - y² - 2
semoga membantu