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  • Two numbers have a difference of 15 and a product of 199.75.

    Two numbers have a difference of 15 and a product of 199.75.
    The larger of the two numbers is x.
    (a) Show that
    x2 – 15x – 199.75 = 0
    (3)
    (b) Solve the equation
    x2 – 15x – 199.75 = 0
    X2是 X的2次方
    英語人氣:179 ℃時間:2020-04-01 07:53:44
    優(yōu)質(zhì)解答
    Since X is larger,X-15 is the smaller No.Therefore,199.75=x*(x-15)
    a)LHS=x2-15x-x·(x-15)
    =0
    =RHS
    b)x=-8.5 or23.5
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