Science:Math Exam Resources/Courses/MATH152/April 2017/Question A 08
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Question A 08 

For questions A8 and A9 below, let and for some constant . Briefly justify your answers. A8) For which nonzero value or values of a (if any) is ? 
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! 
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Hint 

Recall the definition of for a vector . 
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.

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Solution 

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So exactly when and so

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