? 發問於 科學及數學數學 · 6 月前

Maths problem: how to do, thanks?

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  • 6 月前
    最愛解答

    早晨。(◕‿◕✿)

    (i) Write -8 as the difference of two square numbers:

    -8 = 1 - 9 = 1² - 3²

    (ii) Factorize the expression:

    m² - 2m - 8

    = m² - 2m + 1² - 3²

    = m² - 2m(1) + 1² - 3²

    = (m - 1)² - 3²

    = [(m - 1) + 3] [(m - 1) - 3]

    = (m + 2)(m - 4)

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