if x minus one by x is equal to 4 find the value of x squared plus 1 by x in solutions
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x-1/x=4
squaring both side
x^2+1/x^2-1=4
x^2+1/x^2=5
squaring both side
x^2+1/x^2-1=4
x^2+1/x^2=5
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