Simplify. Identify any x values for which the expression is undefined.

-x^{2}+16

---------

-x^{2}-9x-20

Please hurry! This is urgent!

rarinstraw1195
Mar 14, 2017

#1

#2**0 **

I'm really cutting a few deadlines close, and it is due to... PROCRASTINATION. the wonderful thing that makes a person do both 30 minutes of work in 8 hours and 8 hours of work in 30 minutes.

rarinstraw1195
Mar 14, 2017

#3**+5 **

This will be undefined when

-x^2 -9x - 20 = 0 multiply through by -1

x^2 + 9x + 20 = 0 factor

(x + 4) ( x + 5) = 0

Setting both factors to 0 and solving for x we have that the function will be undefined

whenever x = - 4 or x = - 5

CPhill
Mar 14, 2017

#5**+10 **

Here's a tip for these types of problems that may prevail later on. Set the denominator eual to zero and try to factor the denominator.

HighSchoolCalculus
Mar 14, 2017