book Maths Puzzle Numerical Ability

Simplify by dividing:

x^3+2x^2+3x-6/x-1

I don't understand why I can't do this, but I know once I see it I'll hopefully understand! :)

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book Other Question

n^200<5^300 find the value 0f n. 1.)
Find three consecutive odd integers such that the sum of the first and third is 37 more than the second.

2.)
The sum of 4 consecutive integers is at least 114. Find the smallest possible values for the four numbers.