Question
Factorise:
$x^2+\frac{1}{x^2}-11$ [Hint. Given Exp. $=\left(x^2+\frac{1}{x^2}-2\right)-9$ ]
$x^2+\frac{1}{x^2}-11$ [Hint. Given Exp. $=\left(x^2+\frac{1}{x^2}-2\right)-9$ ]
✓
Answer
$\left(x-\frac{1}{x}+3\right)\left(x-\frac{1}{x}-3\right)$
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