The x coordinates of the points of inflection of the graph of are...
D 0 and 3,
E 0 and 1
So, thanks to the graph and knowledge of the definition of inflection point (y''= 0).
I choose D.
However, the book says C.
I'm inclined to believe it is right because I did the sign test for 0 for numbers less than 0 and less than 3, thought I may be incorrect of which function to put the test values into (y'' right?), and got the same sign (negative).
So, did I do the sign test wrong? Or is the right and I'm confusing myself with these questions.
What is the answer to the problem?