:) (x² + 3x)² - 5 (x² + 3x)-y (x² + 3x)+ sy
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Step-by-step explanation:
- x⁴+3x²- 5x² -15x-x²y - 3xy + sy
- x⁴ - 2x²-15x-x²y -3xy +sy
- the answer will be completed.
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