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Question 01 (b) 

Evaluate . 
Make sure you understand the problem fully: What is the question asking you to do? Are there specific conditions or constraints that you should take note of? How will you know if your answer is correct from your work only? Can you rephrase the question in your own words in a way that makes sense to you? 
If you are stuck, check the hint below. Consider it for a while. Does it give you a new idea on how to approach the problem? If so, try it! 
Hint 

Simplify the fraction by making use of the third binomial formula . 
Checking a solution serves two purposes: helping you if, after having used the hint, you still are stuck on the problem; or if you have solved the problem and would like to check your work.

Solution 1 

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Please rate my easiness! It's quick and helps everyone guide their studies. Multiplying top and bottom by the fraction simplifies to
Hence, taking the limit we find that

Solution 2 

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Please rate my easiness! It's quick and helps everyone guide their studies. Factoring the denominator gives us where the last equality comes from cancelling out the factors of from the numerator and denominator. Hence, we obtain: 