if a square +1/a square =14 find value of a+1/a
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a²+1/a²=14
=> a²+1/a²+2*a*1/a= 14+2*a*1/a (adding 2a*1/a both sides)
=> (a+1/a)²= 14+2
=> (a+1/a)²=16
=> a+1/a=√16
=> a+1/a=±4
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