SELF Maths Puzzle Numerical Ability Quadratic Equations

sqrt(x^2-2x+5)+2x^2-8x+4 = 0
find value(s) of x.

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SELF Other Question

IF 1 = -1
2 = 2
3 = 15
4 = 44
5 = 95
then 10 = ?
1,1,0,-2,-6,-9, ...
next term of this sequence ?