Final answer:
To solve the expression 56 - 10x^2 + 20 + 8x, we combine like terms to get -10x^2 + 8x + 36.
Step-by-step explanation:
To solve the expression 56 - 10x^2 + 20 + 8x, we combine like terms. Start by simplifying 56 and 20 to get:
-10x^2 + 8x + 36.
This expression cannot be further simplified, so the answer is option D: 36.