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OpenStudy (anonymous):
Use the concavity test to determine the intervals on which the graph of y=4x^3+21x^2+36x-20 is concave up and concave down?
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OpenStudy (anonymous):
find the second derivative. it will be a line with positive slope (in fact the slope will be 24) set it equal zero and solve for x. function will be concave up to the left, and concave down to the right of your zero
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