What is the critical f(x)=20x-2x^2 ?

The critical f(x)=20x-2x^2 is x=5

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critical f(x)=20x-2x^2

critical points

f (x) = 20 x - 2 x^{2}

x = 5

Solution steps

20 x - 2 x^{2}

Find where

f^{'} (x)

is equal to zero or undefined

x = 5

Identify critical points not in

f (x)

domain

Domain of

20 x - 2 x^{2} : - \infty < x < \infty

All critical points are in domain

x = 5

y + 2 x = 5

g (x) = x + 1

5 - 1

(- 4, - 4), (5, 0)

\frac{x ^{2} - 9}{x + 3}