book Maths Puzzle Numerical Ability

f(x)= log x

I dont even know how to begin.

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book Other Question

when factoring can these two have the same answer?

x^2-2xy+y^2 and x^2+2xy+y^2

if so is it because adding -xy and -xy is either -2xy or +2xy
while +xy and +xy can only +2xy Can someone please answer the question 2700, that is already on your site.

Thank yuou very much!