Question: Use a graphing device as in Example 4 (or Newtons method or solve numerically using a calculator or computer) to find the critical points of

Use a graphing device as in Example 4 (or Newton’s method or solve numerically using a calculator or computer) to find the critical points of f correct to three decimal places. Then classify the critical points and find the highest or lowest points on the graph, if any.

f(x, y) = y6 - 2y4 + x2 - y2 + y

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