Find maximum and minimum values of x^3 + 3xy^2 - 15x^2 - 15y^2 + 72x
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Please find the attachment
Now check AC - B square for every point
AC - B square if positive
Check sign of A
If positive f is min
If negative f is max
Now check AC - B square for every point
AC - B square if positive
Check sign of A
If positive f is min
If negative f is max
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maximum and minimum value of x^2+3xy^2-15y^2-15x^2+72x
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