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OpenStudy (anonymous):
on what intervals ln(x^2+4) concave up?
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OpenStudy (campbell_st):
I think its concave up for all real x
OpenStudy (anonymous):
thats not the answer apparently :( i thought so too
OpenStudy (hoblos):
f(x)=ln(x^2+4) f'(x)= 2x/(x^2+4) f''(x) = - 2(x^2 -4)/ (x^2 +4)^2 f(x) concave up when f''(x)>0 f(x) concave up for -2<x<2
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