5x² + y² + 28z² + 2√5xy + 4√74z + 4√35 xz
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*Step-by-step explanation:*
7x² - 5xy + 10y² + 5x - 4y - (5x² - 6y² + 8y - 9x)
= 7x² - 5xy + 10y² + 5x - 4y - 5x² - 6y² + 8y - 9x
= 7x² - 5x² - 5xy + 10y² - 6y² + 5x - 9x - 4y + 8y
= 2x² - 5xy + 4y² - 4x + 4y
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