book Maths Puzzle Numerical Ability

Please solve:

x^4 - 4x^3 + 3x / x^2 -1

I get x^2 - 4x + 1 - x + 2/x^2 - 1

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book Other Question

would you pleas walk me threw this problem 3(1+4n)- 2(5n-3)=25 Luke started walking from his home at noon. By 2 p.m. he reached the park, which is 3 miles away.
A. write an equation that relates time x and distance y from home, assuming Lu