points of inflection

[narrow saffron]

can someone help me solve 20? i can’t figure out how to get the points of inflection from the second derivative

[zenith crown]

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[vivid canopy]

Looks like you have a mistake, it’s 3(x-1)(x-2)^2

Anyways just find when the sign of the second derivative changes

[narrow saffron]

alright , thank you

[willow zephyr]

@untold zodiac has given 1 rep to @vivid canopy

[narrow saffron]

also could you help me with one more thing

[vivid canopy]

Sure what is it

[narrow saffron]

can you help me do this problem? i got stuck