book Maths Puzzle Numerical Ability

how can i see how many cases are in solving this rational inequality:(x+1)(x+2)/(x-1)? how will I be able to see the possible cases.What general rule should I actually follow?

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book Other Question

the sum of two consecutive odd integers is 40 find the numbers Need Help please!
2) Use the geometric sequence of numbers 1, 3, 9, 27, � to find the following:
a) What is r, the ratio between 2 consecutive terms?
Answer:
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