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5 March, 00:44

Write as a polynomial (a+2b) (4a-5b) - (3a-b) (b-a)

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  1. 5 March, 01:10
    0
    7a^2-ab-9b^2

    Step-by-step explanation:

    Let's do this in two steps. First, we multiply the first two parentheses:

    (a+2b) (4a-5b)

    4a^2-5ab+8ab-10b^2 = 4a^2+3ab-10b^2

    Then, do the other two parentheses:

    (3a-b) (b-a)

    3ab-3a^2-b^2+ab = 4ab-3a^2-b^2

    Then, combine them:

    4a^2+3ab-10b^2-4ab+3a^2+b^2 = 7a^2-ab-9b^2
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