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let f(x)=(-2x)/(x2-x-12). There are two numbers that are not in the domain of f. Give the larger value to 2 decimal places.

Deathstroke_rule  Feb 26, 2017
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f(x)=(-2x)/(x^2-x-12)

 

This will be undefined whenever  ( x^2 - x - 12)  = 0

 

So.....factoring, we  have

 

(x - 4) ( x + 3)   = 0

 

And the function is  undefined  when x = 4 or  x = -3

 

So.....4 is the larger number not in the domain

 

cool cool cool

 

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CPhill  Feb 26, 2017

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