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On what intervals is the function f(x)=x^4-j4x^3 both decreasing and concave up? x<3 x<0 or 2<x<3...

On what intervals is the function f(x)=x^4-j4x^3 both decreasing and concave up?

x<3

x<0 or 2<x<3

0<x<3

x>3 or 0<x<2

x<3 or -2<x<3

Math   Calculus   
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