For what value of \( k \) is the function \( f(x)=\left\{\begin{aligned} k x^{2}, & x \geq 1 \\ ...

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For what value of \( k \) is the function \( f(x)=\left\{\begin{aligned} k x^{2}, & x \geq 1 \\ 4, & x1 \end{aligned}\right. \) continuous at \( x=1 \).
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