To find the sum of the expression 3x² + 5x + 8 + 5x² + 13x + 5, we first need to combine like terms.
1. **Identify Like Terms:**
– The like terms for x² are 3x² and 5x².
– The like terms for x are 5x and 13x.
– The constant terms are 8 and 5.
2. **Combine the x² Terms:**
3x² + 5x² = 8x²
3. **Combine the x Terms:**
5x + 13x = 18x
4. **Combine the Constant Terms:**
8 + 5 = 13
5. **Final Result:**
Putting it all together, we have:
8x² + 18x + 13
So, the sum of the expression 3x² + 5x + 8 + 5x² + 13x + 5 is 8x² + 18x + 13.