# Science:Math Exam Resources/Courses/MATH110/April 2017/Question 07 (c)

MATH110 April 2017
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### Question 07 (c)

For the value of ${\displaystyle k}$ found in part (b), prove that there exists a number ${\displaystyle c}$ in ${\displaystyle (-4,2)}$ such that ${\displaystyle f'(c)=-1}$. Make sure you justify your claims.

 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!