book Maths Puzzle Numerical Ability

reduce to lowest terms

neg 2X minus 8 over x squared plus 2x minus 8

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book Other Question

solve: log(6x)-log(x+1)=log4 I saw a similar problem posted but am not sure of the solution to this one. Can someone help?
16^3/2
I got the answer as 6, because 16 = 4^4 and 4 times 3/2 = 12/2 =6 am I right? If not can someone please explain? Thanks.