I'm having trouble figuring out how to simplify the last bit of this quadradic equation: 4x^2 + x -1/4 = 0

I've gotten down to x + 1/4 = + or - the square root of 1/32 (sorry i'm new on this board and don't really know how to write it out)... is the answer already simplfied (it doesn't seem like it) or can I go further? I would not remember how to simplfy the square root of 1/32.

Thanks