Can You Tackle This Tricky Definite Integral Challenge?

logicalman
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Who can solve or give hint for the following integral?

\int_0^4 3x \sqrt{5^2-x^2}dx :-p :eek:
 
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Try a technique you learned in class!
 
Try u=5^2-x^2, which means du = -2xdx
 
Thanks!

u^2=5^2-x^2 << This one works better. :-p
 

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