Science:Math Exam Resources/Courses/MATH105/April 2010/Question 01 (b)

MATH105 April 2010

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Question 01 (b)
Let $\displaystyle f(x,y)=xe^{2y}+y^{2}$ Evaluate ${\frac {\partial ^{2}f}{\partial y^{2}}}$

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 hints below. Read the first one and consider it for a while. Does it give you a new idea on how to approach the problem? If so, try it! If after a while you are still stuck, go for the next hint.

Hint 1
What does the symbols ${\frac {\partial ^{2}f}{\partial y^{2}}}$ mean in plain English?

Hint 2
Recall that when computing a partial derivative with respect to the variable y, you have to treat the variable x as if it was a constant, so for example the partial derivative of xy with respect to the variable y is simply x the same way that the derivative of 3y with respect to y would be 3.

Checking a solution serves two purposes: helping you if, after having used all the hints, you still are stuck on the problem; or if you have solved the problem and would like to check your work. If you are stuck on a problem: Read the solution slowly and as soon as you feel you could finish the problem on your own, hide it and work on the problem. Come back later to the solution if you are stuck or if you want to check your work. If you want to check your work: Don't only focus on the answer, problems are mostly marked for the work you do, make sure you understand all the steps that were required to complete the problem and see if you made mistakes or forgot some aspects. Your goal is to check that your mental process was correct, not only the result.

Solution

Found a typo? Is this solution unclear? Let us know here. Please rate my easiness! It's quick and helps everyone guide their studies. We are asked here to compute the second derivative of the given function with respect to y. So we start by taking the first derivative with respect to y and obtain ${\frac {\partial f}{\partial y}}(x,y)=2xe^{2y}+2y$ (Remember that while doing this, we treat the variable x as if it was a constant). And now we go on for the second derivative with respect to y and obtain ${\frac {\partial ^{2}f}{\partial y^{2}}}(x,y)={\frac {\partial }{\partial y}}\left({\frac {\partial f}{\partial y}}(x,y)\right)=4xe^{2y}+2$

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