Question 1

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Let us consider the function g colon real numbers squared rightwards arrow real numbers squared, g element of C to the power of 1 open parentheses real numbers squared close parentheses which complies that g open parentheses 0 comma 0 close parentheses equals negative 2 , and the surface S defined by the equation xz cubed plus zg left parenthesis x comma y right parenthesis equals x to the power of 3 end exponent plus y to the power of 3 end exponent plus z squared.

Knowing that this equation defines z equals z left parenthesis x comma y right parenthesis in a neighbourhood of the point open parentheses 0 comma 0 comma negative 2 close parentheses, the conditions that must meet the differential of g in order to z left parenthesis x comma y right parenthesis has a critical point at the origin.

The solution must be expressed according to the following criteria

fraction numerator partial differential g over denominator partial differential x end fraction equals 1 third space space space space fraction numerator partial differential g over denominator partial differential y end fraction equals negative 1 third

1 third space minus 1 third

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