Find a formula for a curve of the form https://instruct.math.lsa.umich.edu/...27827f2ed1.png for https://instruct.math.lsa.umich.edu/...4a913333a1.png with a local maximum at https://instruct.math.lsa.umich.edu/...a20d01b751.png and points of inflection at https://instruct.math.lsa.umich.edu/...23640869f1.png and https://instruct.math.lsa.umich.edu/...767e0da161.png.

I know what a is, just not b, please help!

thank you in advance