Question 100595
2T^-4 -5T^-2 +2=0 

--------------
Let x = T^-2

You get:
2x^2 - 5x + 2 = 0
(2x-1)(x-2)=0
x = 1/2 or x = 2
----------------
Therefore:
T^-2 = 1/2 or T^-2 = 2

T = (1/2)^(-1/2) or T = 2^(-1/2)
T = sqrt2 or T = (sqrt2)/2

=========================
Cheers,
Stan H.