Question

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Answer 1

See the definition of inflection point here: http://mathworld.wolfram.com/InflectionPoint.html

it also gives the necessary and sufficient condition; based on f"(x).

Answer 2

"A necessary condition for x to be an inflection point is f''(x)=0.

A sufficient condition requires f''(x+epsilon) and f''(x-epsilon) to have opposite signs in the neighborhood of x."

Answer 3

is it 4

Answer 4

" to state x-coordinates of the inflection points"

x=4 is one of 'em :)

Answer 5

oh ok so 4 n 0

Answer 6

@chris215 correct :) good job!

Answer 7

thank you!!