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Consider the equation below. (If an answer does not exist, enter DNE.) f(x) = x4 −...

Consider the equation below. (If an answer does not exist, enter DNE.)

f(x) = x4 − 8x2 + 7

(b) Find the local minimum and maximum values of f.

(c) Find the interval on which f is concave up. (Enter your answer using interval notation.)

(d) Find the interval on which f is concave down.(Enter your answer using interval notation.)

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