exam Maths Puzzle Numerical Ability

Hello! I am having problems with with the problem and need some help.

solve: Square root x-1 =x-3


Thank you for the help

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exam Other Question
(x^2-25)/(x^3-4x^2-5x)*(x^2+x)/(1-x^2) y=(4-x)-1
this is is a square root