Answer
See graph, local maximum $f(0)=0$, local minima $f(-0.71)=-0.25$ and $f(0.71)=-0.25$,
increasing on $(-0.71,0), (0.71,2)$, decreasing on $(-2,-0.71),(0,0.71)$.
Work Step by Step
Step 1. See graph for $f(x)=x^4-x^2$,
Step 2. We can find a local maximum $f(0)=0$, local minima $f(-0.71)=-0.25$ and $f(0.71)=-0.25$,
Step 3. the function is increasing on $(-0.71,0), (0.71,2)$, decreasing on $(-2,-0.71),(0,0.71)$.
