Identify any extrema of the function by recognizing its given form or its form after completing the square. Verify your

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Identify any extrema of the function by recognizing its givenform or its form after completing the square. Verify your resultsby using the partial derivatives to locate any critical points andtest for relative extrema. (If an answer does not exist, enterDNE.)
f(x, y)= x2 + y2 + 8x − 6y + 9