Question on the Quiz
I had "quiz1-3".
For question #9 (the last question), "find all intervals on which f is concave up". I did -6<=x<=3.5, but x<=3.5 was wrong, I don't know why. What should be the right answer? Can someone help me?
For question #9 (the last question), "find all intervals on which f is concave up". I did -6<=x<=3.5, but x<=3.5 was wrong, I don't know why. What should be the right answer? Can someone help me?
posted by Yuchen Z. at 11:33 AM
1 Comments:
This question was actually kind of tricky, because i think some parts of the graph are linear. If you look carefully, [-6, -4.5] is linear with a negative slope. [-2.3, 1.5] is linear with a positive slope. Thus [1.5, 6] is concave down, and the only concave up part of the graph is [-4.5, -2.3]. (All of my intervals are approximated.) So Yuchen, I think your interval was too large and included linear parts. Isabel, you may have mixed up concave up and concave down, unless you had a different version of the quiz. (Concave up makes the shape of a U.)
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