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yumang

請求詳細解?

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  • leung_po_chuen
    2020-08-20 16:45:13
    f(x) = (x+2)(x^2+ax+b) = x^3+(a+2)x^2+(2a+b)x +2b => a= -4, b =7 k=14. Look at the quadratic equation x2-4x+7 . It does not have a real root. Hence f(X) only have one real root i.e. -2
  • 解數雜貨店
    2020-08-20 19:52:05
    Correction: b=9 and k=18
  • leung_po_chuen
    2020-08-20 20:50:54
    Oh Sorry!
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