book Maths Puzzle Numerical Ability

Is the vertex of the graph of y= -99(x-7)^2 -2 a minimum or maximum value?

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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
my answe Please help me with these problem..
solve by any method.
1)x^2+25=10x
2)10h-2=11h^2