Answer:
-3x^4-3x+15x^2
Hope it helps
The 1st option
- 3 + 15x² - 3x
Explanation:
Given
(5 - 3x + 8x²) - (8 - 7x²)
Remove the parenthesis on first and distribute second by - 1
= 5 - 3x + 8x² - 8 + 7x² ← collect like terms
= - 3 + 15x² - 3x ← in standard form
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+ 15x² - 3x - 3x + 8x²) - (8 - 7x²) - 3x + 8x² - 8 + 7x² ← collect like terms + 15x² - 3x ← in standard form