Subtract: -x2 + 10x - 5 from 5x - 10

Subtract: -x² + 10x - 5 from 5x - 10

(5x - 10) - (-x² + 10x - 5) = 5x - 10 + x² - 10x + 5

= x² + 5x - 10x - 10 + 5

= x² - 5x - 5

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