At what values of x does f(x) = x^4 - 8x^2 have a relative minimum. A. 0 and -2 only B. 0 and 2 only C. 0 only D. -2 and 2 only E. -2, 0, and 2
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Originally Posted by DINOCALC09 At what values of x does f(x) = x^4 - 8x^2 have a relative minimum. A. 0 and -2 only B. 0 and 2 only C. 0 only D. -2 and 2 only E. -2, 0, and 2 step 1: find the first and second derivative step 2: set the first derivative to zero and solve for x. step 3: plug in your x-values from step 2 into the second derivative. the ones that give you a positive result are the points you want
so the answer should b D then?
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