Multiply (5x^2+x-4) (x+2)

5x³ + 11x² - 2x - 8

Step-by-step explanation:

Each term in the second factor is multiplied by each term in the first factor, that is

5x² (x + 2) + x (x + 2) - 4 (x + 2) ← distribute the parenthesis

= 5x³ + 10x² + x² + 2x - 4x - 8 ← collect like terms

= 5x³ + 11x² - 2x - 8