SAT Math Practice Question
The expression $\frac{1}{3} x^{2}-2$ can be rewritten as $\frac{1}{3}(x-k)(x+k)$, where $k$ is a positive constant.What is the value of $k$ ?
- A.2
- B.6
- C.$\sqrt{2}$
- D.$\sqrt{6}$
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