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OpenStudy (anonymous):
Find the solution of differential equation: dy/dx=8/(7-x)...so my professor solved the equation and got -8Lnabs(7-x)+c using u subsitution where u=7-x and du=-dx or dx=-du. I don't understand why dx= NEGATIVEdu....could someone please explain this to me?! thank you!
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OpenStudy (turingtest):
if you take the differential of u=7-x you get\[du=d(7-x)=d(7)-dx=0-dx=-dx\]
OpenStudy (anonymous):
Perfect, thank you so much!
OpenStudy (turingtest):
welcome!
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