Find the range of values of k for which the quadratic function x^2 - (2k + 1)x + 5

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Mathematics Higher Level for the IB Diploma | 3 Polynomials
page 85 | question 10
Find the range of values of k for which the quadratic function x^2 - (2k + 1)x + 5 has at least one real zero.
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必須附加一個條件:x 有實數解。否則,只要判別式不等於零,x 總有兩個解,要麼兩實根,要麼是一對共軛複數根。

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