Answer:
7x² - 3x - 4
Step-by-step explanation:
Step 1: Write expression
(6x² - x + 3) + (-2x + x² - 7)
Step 2: Combine like terms (x²)
7x² - x + 3 - 2x - 7
Step 3: Combine like terms (x)
7x² - 3x + 3 - 7
Step 4: Combine like terms (constants)
7x² - 3x - 4
