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Oct 02 2009
By: SpankTehMonkey Uncharted Territory 2146 posts
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please help with math problem

1 replies 6 views Edited Oct 2, 2009

Find the domain of the function

 

F(X) = X-2/ (square root x+5) please help me, thank you!

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Izl
Fender Bender
Registered: 04/05/2007
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Re: please help with math problem

Oct 2, 2009

X-2

------                 

sqr(x+5)

 

 

 multiply denominator by sqr(x+5) to get rid of the sqr, and whatever you do to the denominator, you gotta do to the numerator, so:

 

 

X-2   *   sqr(x+5)

-----------------------                 

sqr(x+5)  *  sqr(x+5)

 

 

the square root of somthing times itself equals that number (like square root of 2 * square root of 2 = 2, so you can solve the denominator, 

 

 

X-2   *   sqr(x+5)

-----------------------                 

x+5

 

 

now ur looking for domain, which means what numbers can the x value be, while still making the equation a function,

so, what numbers don't make the denominator zero?  the answer is: all real numbers, except for that number 

 

you could have answered it without changing what the equation looks like, i just tried to simplify it. 

 

 

 

 

 

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