 decreasing and concave down, and here it will change to concave up. After 7 it’s increasing and concave up. Something like that. This is a rough sketch of our y equals f(x); our cubic function.
Remember 3 basic steps; Take the first and second derivative. Make a sign chart for the derivatives and then use your sign chart to identify local max and min and inflection points. Plot those points and also intercepts if they’re easy. You should get a pretty good graph as a result of that.
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