find the intervals on which the function is increasind and decreasing

Algebra
Tutor: None Selected Time limit: 1 Day

find the intervals on which the function is increasind and decreasing:

-3x squared + 18X + 81

Jun 3rd, 2015

Thank you for the opportunity to help you with your question!

(-3x^2+18x+81)'=-6x+18

function increasing--derivative>0-- -6x+18>0, -6x>-18, x<3

function decreasing--derivative<0-- -6x+18<0, -6x<-18, x>3

increasing: (-infinity, 3)

decreasing: (3, infinity)

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 3rd, 2015

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