Question

if x +1÷x =10 then find the value of :x^2 + 1 ÷ x^2 plz fast

Answer 1

The question gives you x+(1/x)=5 and it is asking for x^2+(1/x^2) 
well, remember (a+b)^2=a^2+2ab+b^2 
Let's square the question given, that gives you x^2+2*x*(1/x)+(1/x^2)=25 
since 2*x*(1/x)=2,then 
x^2+(1/x^2)=25-2=23