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OpenStudy (anonymous):
can somebody help me with an integral ill post it
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OpenStudy (anonymous):
\[\int\limits_{}^{}x^3\div \sqrt{4+x^2} dx\]
OpenStudy (beginnersmind):
Have you tried the substitution u = x^2+4?
OpenStudy (anonymous):
yeah du would just be 2xdx and it wouldnt work
OpenStudy (beginnersmind):
why? You're left with x^2, which is just u-4. So we have (u-4)/sqrt(u) du.
OpenStudy (anonymous):
the derivative of x^2+4 is 2xdx not x^2dx so that wouldnt work
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OpenStudy (lgbasallote):
|dw:1341542417393:dw|
OpenStudy (lgbasallote):
|dw:1341542451665:dw|
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