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posted by Denzel on Thursday, November 4, 2010 at 9:08pm.
Find all critical numbers: (x^2+12)(9-x^2)?
ok. well first of all, use the product rule: f(x)g'(x) + g(x)f'(x) then set the derivative = to 0 (x^2 +12)(-2x) + (9-x^2)(2x)=0
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