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19 June, 19:13

If M = 5x² + 7x - 4 and N = - 3x² - 4x + 5, then M - N equals ...

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  1. 19 June, 22:58
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    M - N =

    (5x^2+7x-4) - (-3x^2-4x+5) =

    Distribute - 1 through the second parentheses

    5x^2+7x-4 + 3x^2+4x-5=

    combine like terms

    8x^2 + 11x - 9
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