1. **State the problem:** Simplify the expression $120x^8 + 240x^8 + 360x^8$. 2. **Identify like terms:** All terms have the same variable part $x^8$, so we can add their coefficients. 3. **Add the coefficients:** $$120 + 240 + 360 = 720$$ 4. **Write the simplified expression:** $$720x^8$$ 5. **Explanation:** Since all terms have the same variable and exponent, we simply add the numbers in front of $x^8$ to combine them into one term.