if x+1/x=20 therefore x² +1/x²=?
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x+1/x=20 —given
Squaring both sides
(x+1/x)^2=(20)^2
x^2+1/x^2+2. 1/x.x=400
x^2+ 1/x^2=400-2
x^2+1/x^2= 398
Squaring both sides
(x+1/x)^2=(20)^2
x^2+1/x^2+2. 1/x.x=400
x^2+ 1/x^2=400-2
x^2+1/x^2= 398
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