Let $f ( x ) = x ^ { 4 } - 2 x ^ { 2 } + 1$ . Use the graphs of f, $f ^ { \prime }$ , and $f ^ { \prime \prime }$ to estimate, to two decimal places,
(a) the critical numbers of f.(b) the interval(s) where f is decreasing.(c) the interval(s) where f is concave upward.

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The Answer of Let $f ( x ) = x ^ { 4 } - 2 x ^ { 2 } + 1$ . Use the graphs of f, $f ^ { \prime }$ , and $f ^ { \prime \prime }$ to estimate, to two decimal places,
(a) the critical numbers of f.(b) the interval(s) where f is decreasing.(c) the interval(s) where f is concave upward.

Let f(x)=x4−2x2+1f ( x ) = x ^ { 4 } - 2 x ^ { 2 } + 1f(x)=x4−2x2+1

Let $f ( x ) = x ^ { 4 } - 2 x ^ { 2 } + 1$