Let f(x) = -4x^2 + 4x + 14. Find the x-value(s) where the graph of the function has a horizontal tangent line. Separate multiple answers with commas. Enter DNE if there are no such x. x =
Added by Jeremy A.
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\[f'(x) = -8x + 4\] \[0 = -8x + 4\] \[8x = 4\] \[x = \frac{4}{8}\] \[x = \frac{1}{2}\] ** Show more…
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