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Question
If `"m" -1/"m"=5`, find: `"m"^4+1/"m"^4`
Sum
Solution
`"m"^4+1/"m"^4=("m"^2+1/"m"^2)^2-2`
= (27)2 − 2
= 729 − 2
= 727
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Important Formula of Expansion
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Expand : (2a – 5b – 4c)2
