Roger has the value function (x) = √x for gains and v(x) = -a√1x1 for losses, where a=3.5. He is offered a 50-50 gamble where he gets $2 if he wins and gets $1 if he loses. Calculate Roger's value of the gamble if he takes the worst possible outcome (getting $1) as his reference point. (Round your answer to two decimal places, add a minus sign if your answer is negative, and don't add a dollar sign; e.g. -1.23)