book Maths Puzzle Numerical Ability

Factor
(x-y)^2 - (x-z)^2
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book Other Question

What are the asymptotes of the functions "f(x) = 3x" and "g(x) = log52x"? Okay this is a function of a right triangle where side a is equal to 16 and its corresponding angle is 45 degrees side b and the hypoteneous are unknown. Is there a way to solve for the two missing sides?