+0

# Help!

+6
325
6
+5210

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

-x2+16
---------
-x2-9x-20

rarinstraw1195  Mar 14, 2017

#6
+5210
+10

Thanks for the tip!

rarinstraw1195  Mar 14, 2017
Sort:

#1
+91773
0

Why is it urgent?  Are you doing a test?

Melody  Mar 14, 2017
#2
+5210
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
#4
+91773
0

Yes I can totally relate to that. :(

Melody  Mar 14, 2017
#3
+82576
+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
+1483
+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
#6
+5210
+10