Final answer:
The original expression is A. 8x²y + 7x² - 5y² + 3x - 2 + 2xy - x² - 2y² - 3x - 4.
Step-by-step explanation:
To determine which expression could be the original expression, we need to compare it with each of the answer choices and find the one that matches. Let's simplify the given expression:
10x + y + 6x² - 7y² - 6
The simplified form of the expression is:
6x² - 7y² + 10x + y - 6
Comparing this with each option, we find that option A matches the original expression. Therefore, the answer is A. 8x²y + 7x² - 5y² + 3x - 2 + 2xy - x² - 2y² - 3x - 4.