book Maths Puzzle Numerical Ability

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

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book Other Question
Is the vertex of the graph of y= -99(x-7)^2 -2 a minimum or maximum value? x^4-5x^3+12x^2-5x-2
factorise it