book Maths Puzzle Numerical Ability

I need to solve the equation square root of x+56=x and i ned to check for extraneous solutions

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book Other Question

HI i am trying to find out what the slopes are for these two inequalities 3x<-6 , 3m-18>-6 Find (a)the directix,(b)the focus and (c)the roots of the parabola y=x^2-5x+4