Ecan read from these graphs that the absolute minimum is about 0 incorrect: your answer is incorrect. and occurs when x ≈ 1.5 incorrect: your answer is incorrect. in the second graph. there is also a local maximum ≈ 0.00002 when x ≈ in the third graph and a local minimum ≈ 211 when x ≈ in the last graph. these graphs also show three inflection points near −35, −5, and −1 and two between −1 and 0. to estimate the inflection points closely we would need to graph f '', but to compute f '' by hand is an unreasonable chore. if you have a computer algebra system, then it's easy to do. (see this exercise.)