What is the critical (7x)/(x^2-9) ?

The critical (7x)/(x^2-9) is None

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critical (7x)/(x^2-9)

critical points

\frac{7 x}{x ^{2} - 9}

None

Solution steps

\frac{7 x}{x ^{2} - 9}

Find where

f^{'} (x)

is equal to zero or undefined

x = - 3, x = 3

Identify critical points not in

f (x)

domain

Domain of

\frac{7 x}{x ^{2} - 9} : x < - 3 or - 3 < x < 3 or x > 3

\frac{7 x}{x ^{2} - 9}

is not defined at

x = - 3, x = 3

, therefore:

None

y = \frac{2 - x ^{2}}{3 x ^{2} - 1}

x 7 - x

f (x) = 2 x^{3} - 9 x^{2} + 2

f (x) = 3 y^{3} - x^{2} \cdot y^{2} + 8 y^{2} + 4 x^{2} - 20 y

f (x) = 2 x + \frac{300000}{x}