1.
If α\alpha and β\beta be two roots of the equation x264x+256=0x^2 - 64x + 256 = 0, then the value of (αβ)1/2+(βα)1/2\left(\dfrac{\alpha}{\beta}\right)^{1/2} + \left(\dfrac{\beta}{\alpha}\right)^{1/2} is: