Question
Decide whether the following equation is quadratic equation or not : $x+\frac{1}{x}=-2$
✓
Answer
$\begin{array}{l}
x+\frac{1}{x}=-2 \\
x^2+1=-2 x \Rightarrow x^2+2 x+1=0
\end{array}$
$\therefore$ it is a quadratic equation because it is the form of $ax ^2+ bc + c =0$
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