Question

What must be added to 2x^2 - 5x - 12 in order to get 7x^2 - x - 18

Answer 1

5x² + 4x - 6

Explanation:

Subtract 2x² - 5x - 12 from 7x² - x - 18 , that is the opposite operation, that is

7x² - x - 18 - (2x² - 5x - 12) ← distribute parenthesis by - 1

= 7x² - x - 18 - 2x² + 5x + 12 ← collect like terms

= 5x² + 4x - 6