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OpenStudy (anonymous):
Find the points where the graph of the function has horizontal tangents. f(x) = 6x^2 + 6x +5 The answer is supposed to be -1/2, 7/2; however, I'm not sure how to get 7/2? I first found the derivative: 12x +6. Then, I factored out, which would simply be 12(x+1/2). Then I found the zero, which would only be -1/2. Please help! Where does the 7/2 come from, and how do I find it? Thank you :)
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