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

The current in a river is 5km per hour downstream. A motorboat can go downstream a distance X miles in one third the time it takes to come back up the same distance. what is the sp Use Cramer's rule to solve for z:

2x-3y-z=-17
2x+3y-z=-5
3x-2y-z=-20