Posted by Katie S on Wednesday, September 1, 2010 at 4:08pm.
Find the Domain of the function:
f(x)=the square root of the entire fraction- x^2+6x-16 over x^2-2x-15
Pre calc - Reiny, Wednesday, September 1, 2010 at 5:00pm
domain is your choice of x's you can use
First of all the bottom cannot be zero
x^2 - 2x - 15 ≠ 0
(x-5)(x+3) ≠ 0
x≠5 or x≠ -3
Secondly the entire expression cannot be negative, because of the square root part
it simplifies to
clearly any x<-8 and x> 5 are ok
also the expression is positive between -3 and 2
it is negative between -8 and -3, as well as 2 to 5
I will let let you summarize the above.
Make a number line , put those critical values on and mark the line accordingly
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