Answer:
x^2+4x+6
Explanation:
-5x^2+6x^2+8x-4x-3+9
=x^2+4x+6
x² + 4x + 6
- 5x² + 8x - 3 + 6x² - 4x + 9 ← collect like terms
= (- 5x² + 6x²) + (8x - 4x) + (- 3 + 9)
= x² + 4x + 6
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