For the function f(x)=x^4+3x^3−36x^2−68x+240, find the intervals where f(x)>0 but f′(x)<0.   A. x<−6 and −0.8855 C. x<−5.12 and −0.8855

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
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Chapter9: Quadratic Functions And Equations
Section: Chapter Questions
Problem 10SGR
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For the function f(x)=x^4+3x^3−36x^2−68x+240, find the intervals where f(x)>0 but f′(x)<0.

 

A. x<−6 and −0.885<x<2

 

B. −4<x<−0.885 and x>5

C. x<−5.12 and −0.885<x<3.75

 

D. x<−6 and −4<x<2 and x>5

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