Answer:
x³ - 5x² + 4x
Explanation:
Given
x(x - 4)(x - 1) ← expand (x - 4)(x - 1) using FOIL
= x(x² - x - 4x + 4)
= x(x² - 5x + 4) ← distribute
= x³ - 5x² + 4x
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