What is the critical f(x,y)=(x-y)(4-xy) ?

The critical f(x,y)=(x-y)(4-xy) is (2,2),(-2,-2)

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critical f(x,y)=(x-y)(4-xy)

critical points

f (x, y) = (x - y) (4 - x y)

(2, 2), (- 2, - 2)

Solution steps

(x - y) (4 - x y)

Find where

\nabla f (x, y)

is equal to zero or undefined

(2, 2), (- 2, - 2)

\frac{x ^{2} - 9}{x ^{2} + 9}

f (x) = \frac{x ^{2} + x + 4}{( x + 2 ) ^{2}}

f (t) = t - 3 t

49 - x^{2}

f (x) = x^{2} - 2 ln (2 x)

What is the critical f(x,y)=(x-y)(4-xy) ?
The critical f(x,y)=(x-y)(4-xy) is (2,2),(-2,-2)