Answer:
3x^2+6x+10
Step-by-step explanation:
Because you are adding the two polynomials, the parentheses can be removed and the polynomials combined to simplify the expression:
1. x^2 + 6x - 5 + 2x^2 + 15
2. Combine like terms - x^2, x, and constants: 3x^2 + 6x + 10
