solving for when your exponent is a fraction is easy. as shown above you take the equation and put it into a radical equation. So what you do with the fraction is you take the denominator and make it the index and then you take the numerator and make that an exponent for X. And of course B cannot be 0.

the above image is an image of changing mixed radicals into entire so like to do this you have to is put the coefficient into the square root (4) so you square root 4^2 (to the power of 2) (as shown above) then you calculate the square root which is 16 and then inside the square root you do 16 x 5 which is 80 so 4 x the square root of 5 is equal to square root 80.