help f.4 amaths

2007-08-27 11:08 pm
1) The quadratic equations x^2 - 6x + 2k = 0 and x^2 - 5x + k =0 have a         common root α. (i.e. α is a root of both equations.)
  Show that α =k and hence, find the value(s) of k.

2) Let p = (x^2 + 2x + 8)/(x - 2) …………………………(*)
  where x is real. By expressing (*) in the form ax^2 + bx + c = 0,
  find the range of possible values of (x^2 + 2x + 8)/(x - 2).
  Hence, find the range of possible values of ∣(x^2 + 2x + 8)/(x - 2)∣.

回答 (1)

2007-08-27 11:38 pm
參考: My Maths knowledge


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