Question
Bahasa Melayu
Cari julat nilai $k$ supaya $f(x) = x^2 - (k + 1)x + (k + 4)$ adalah sentiasa positif untuk semua nilai nyata $x$.
English
Find the range of values of $k$ for which $f(x) = x^2 - (k + 1)x + (k + 4)$ is positive for all real values of $x$.
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