9x⁴(2x³-5x⁴)5x^6(x⁴-3x²)
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Step-by-step explanation:
18x⁷ - 45x⁸(5x¹⁰ - 15x⁸)
= 90x¹⁷ - 270x¹⁵ - 225x¹⁸ + 495x¹⁶
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