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15 April, 15:40

Write the expression as a polynomial: (a-1) (a-4) (a+5)

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  1. 15 April, 17:35
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    a³ - 21a + 20

    Step-by-step explanation:

    expand the first pair of factors using FOIL

    = (a² - 5a + 4) (a + 5)

    Now, multiply each term in the first factor by each term in the second factor

    = a (a² - 5a + 4) + 5 (a² - 5a + 4) ← distribute parenthesis

    = a³ - 5a² + 4a + 5a² - 25a + 20 ← collect like terms

    = a³ - 21a + 20
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