Question

if x = √6 +√5 then find the value of X2 + 1/X2 - 2​

Answer 1

Answer:X2 + 1/X2 -2

19.94

Step-by-step explanation:

Since X= √6 +√5 which is approximately 4.7 in decimal

Therefore X2=(√6 +√5)*(√6 +√5)= 11+2√30. written as 21.9 in decimal

so therefore let us use decimal form to solve it to make it easier.

X2+1/X2-2

=21.9 + 1/21.9 - 2

Therefore we find the L.C.M which is 21.9

Therefore the equation becomes:

=479.61 + 1 - 43.8/21.9

=436.81/21.9

=19.94