Subtract 3x²+5x-1 from 7x³-x²+4x+6 7x³ - x² + 4x + 6 -(3x² + 5x - 1) ---------------------- Remove the parentheses by changing all the signs: 7x³ - x² + 4x + 6 - 3x² - 5x + 1 ---------------------- Now add vertically term by term: 7x³ - x² + 4x + 6 - 3x² - 5x + 1 ---------------------- 7x³ - 4x² - x + 7 Edwin