The critical number of $f(x)=x^{2}-2 x+9$ is

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The critical number of the function $f(x)=x^{2}-2 x+9$ is $\boxed{1}$.

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Step 1 ：The critical numbers of a function are the x-values where the derivative of the function is either zero or undefined. So, to find the critical numbers of the function $f(x)=x^{2}-2 x+9$, we first need to find its derivative.

Step 2 ：The derivative of the function $f(x)=x^{2}-2 x+9$ is $f'(x)=2x-2$.

Step 3 ：Now, we need to find the x-values where this derivative is zero.

Step 4 ：The critical number of the function $f(x)=x^{2}-2 x+9$ is $\boxed{1}$.

The critical number of $f(x)=x^{2}-2 x+9$ is Answer:

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The critical number of $f(x)=x^{2}-2 x+9$ is

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