Quadratics (id: f632deda6)

本题目来源于试卷: Quadratics，类别为 IB数学

[问答题]
Let $f(x)=x^{2}+k x$ and g(x)=x+k , for $x \in \mathbb{R}$ , where k is a constant.
The graphs of y=f(x) and y=g(x) intersect at two distinct points.
Find the possible values of k .

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