book Maths Puzzle Numerical Ability

how can i soved this equation? coz I keep on solving it but i can't:
[(x^5-3x)+(3x^2-1)][(x^5-3x)-(3x^3-1)]

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book Other Question

I am not sure how to solve this one

ln (square root of x +4) =1

and

log base 2 (x-3) + log base 2x - log base 2 (x+2) =2
how do you work out the table of value for this question y=x²-2x-5