Question

If x=√6+√5 then x^2+1/x^2-2

Answer 1

Step-by-step explanation:

X^2+1/x^2-2 = (x-1/x)2 and if x=√6+√5 then

1/x=1/(√6+√5) multiply above and below by √6-√5 denominator becomes 1 and numerator is √6-√5 thus (x-1/x)2 is (√6+√5-(√6-√5))2 thus it becomes (2√5)2 which is 20