Answer:
13x^3-2x^2+3x+13
Step-by-step explanation:
you add the like terms. For example, you can add 3x^2 and 2x^2, but not 6 and 2x^2.
Answer: 13x³ - 2x² + 3x + 13
5x³ + 3x² - 5x + 4
+ 8x³ - 5x² + 8x + 9
13x³ - 2x² + 3x + 13
