Question

Simplify the following expression by combining like terms.
3x + 4x² - 7x+ 9x2

Answer 1

13x² - 4x

Explanation:

3x + 4x² - 7x + 9x² ← collect like terms

= (4x² + 9x² ) + (3x - 7x)

= 13x² + (- 4x)

= 13x² - 4x