(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Is f increasing or decreasing on f(x)=2x^3+3x^2-36x+5 on [-1,1]

2. Relevant equations

3. The attempt at a solution

f'(x)<0 for all x in (a,b), then x,y and x, y in [a,b] implies f(x)>f(y) and f is decreasing

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Showing increasing or decreasing

**Physics Forums | Science Articles, Homework Help, Discussion**