book Maths Puzzle Numerical Ability

How do you solve absolute value equations?

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book Other Question

Rearrange the following so that the letter becomes the subject

y = 4z √y+z/x; x =

Can you please show your working out, and thank you in advance
Find (a)the directix,(b)the focus and (c)the roots of the parabola y=x^2-5x+4