Find the relative extrema, if any, of the function. Use the Second Derivative Test if applicable. (If an answer does not exist, enter DNE.) g(x) = x4 - 8x² + 7 Part 1 of 6 According to the instruction of the question, we use the Second Derivative Test first. If it fails, then we will use the ---Select--- Notice that the domain of g is (Enter your answer using interval notation.) First, find the first and second derivatives of g(x) = x4 - 8x² + 7. g'(x) = g" (x) =

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