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**Find velocity...**

A 3.00Kg block at x=0 is moving to the right at 5.00m/s.

A horizontal force acts on the block. Its potential energy funtion is U=(-x^2)-4x+5

find the speed of the block at x=2.00m (surface is smooth)

ok the answer is already given by prof. answer is 5.74m/s but I want to know how to solve this. I used kinetic and potential energy equation for this problem but I got 4.52m/s also I used changing kinetic and potential energy but I got 8.50m/s...I tried other things too but I got wrong... I'm stuck with this...