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Expand and simplify x(x+4)(x-5)

Apply FOIL (First, outside, inside, last): (x + 4)(x - 5) = x² - 5x + 4x -20 = x²- x -20 x(x + 4)(x - 5) = x( x²- x -20 ) = x³ - x²- 20x

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