book Maths Puzzle Numerical Ability

Find (a)the directix,(b)the focus and (c)the roots of the parabola y=x^2-5x+4

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book Other Question

I need to solve the equation square root of x+56=x and i ned to check for extraneous solutions Solve x+3=|2x|by graphing f(x)= x+3 and g(x)= |2x|.