book Maths Puzzle Numerical Ability

find center and radius of this circle

x^2+y^2+6x-4y+5=0

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book Other Question

A car moving at 50km/h skids 15m with locked brakes. How far will the car skid with locked brakes at 150km/h? Please help me solve this equation: x = 1 + the square root of 11+x. I am coming up with x= -2 and x= 5 for the solutions. The 5 works, but the -2 does not. Thank you
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