Answer:
x⁴ - 14x³ + 57x² - 126x + 72 is answer
Step-by-step explanation:
(x²-7x)²+18(x²-7x)+72
x⁴ + 49x² - 14x³ + 18x² - 126x + 72
x⁴ - 14x³ + 57x² - 126x + 72
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Answer:
x⁴ - 14x³ + 57x² - 126x + 72 is answer
Step-by-step explanation:
(x²-7x)²+18(x²-7x)+72
x⁴ + 49x² - 14x³ + 18x² - 126x + 72
x⁴ - 14x³ + 57x² - 126x + 72