Find the Integral of (-39240)(9-x^2)^(1/2) with Easy Step-by-Step Guide

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Can someone tell me what is the integral of

(-39240)(9-x^2)^(1/2)
 
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rewritten

-39240 times the square root of (9 - x squared)
 
Alrighty. We have \int -39240\sqrt{9-x^2}dx

This is going to use trig substitution. Any ideas?
 
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