factorise x²+1/x²-11
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Answer:
= ( x - 1/x )² - 3²
Step-by-step explanation:
= x² + 1/x² - 2 - 9
= x² + 1/x² - 2×(x)×(1/x) - 9
[ since, (x)×(1/x) = 1 ]
= ( x - 1/x )² - 3²
= ( x - 1/x + 3 ) ( x - 1/x - 3)
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