What is the critical f(x,y)=xy(5x+y-15) ?

The critical f(x,y)=xy(5x+y-15) is (0,15),(1,5)

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critical f(x,y)=xy(5x+y-15)

critical points

f (x, y) = x y (5 x + y - 15)

(0, 15), (1, 5)

Solution steps

x y (5 x + y - 15)

Find where

\nabla f (x, y)

is equal to zero or undefined

(0, 15), (1, 5)

x^{3} - 12 x y + 8 y^{3}

f (x, y) = x^{3} - 3 x y^{2} + 6 y^{2}

f (x, y) = x^{2} - 8 x + y^{2} + 14 y

f (x) = 5 x^{\frac{4}{5}} - 4 x

f (x) = 2 x^{3} - 5 x^{2} - 3 x + 10

What is the critical f(x,y)=xy(5x+y-15) ?
The critical f(x,y)=xy(5x+y-15) is (0,15),(1,5)