Substrate 5x² - 9x - 10 from 8x² + 10x - 25 = _____?

3x² - 19x - 15

3x² - 19x + 15

3x² + 19x - 15

None of these

First polynomial: 8x² + 10x - 25

Second polynomial: 5x² - 9x - 10

(8x² + 10x - 25) - (5x² - 9x - 10)

= 8x² + 10x - 25 - 5x² + 9x + 10

= 3x² + 19x - 15