Question
If $a^2-3 a-1=0$ and $a \neq 0,$ find $: a-\frac{1}{a}$
✓
Answer
Dividing the given equation by a we get
$a-3-\frac{1}{a}=0$
$\Rightarrow a-\frac{1}{a}=3$
$a-3-\frac{1}{a}=0$
$\Rightarrow a-\frac{1}{a}=3$
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