Question

If x²-1/x = 7, find x²+1/x²
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Answer 1

Answer:

x-1/x=7

squaring both sides

(x-1/x)^2=7^2

x^2+1/x^2-2.x.1/x=49

x^2+1/x^2=49+2

=51

x^2+1/x^2=51