Partial derivatives please help!!

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find the following partial derivatives ay/ax

1. y= 7x,   2.y= 2x^2-3x+7  3. -3x^-3+7/x-4x^2+100

can someone also explain to me how it works I got 0 for the 1st one, but I just want to be sure

Aug 27th, 2015

Hi there! Thank you for the opportunity to help you with your question!

If we have y = 7x, then dy/dx = 7 (taking d/dx from both side)

Similarly in the second problem:

dy/dx = 4x-3

In the third problem I assume you have y=-3x^(-3)+7/x-4x^2+100, whose derivative is:

dy/dx = 9x^(-4) -7/(x^2) -8x

Please let me know if you need any clarification. Always glad to help!
Aug 27th, 2015

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Aug 27th, 2015
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