SOLUTION: Simplify. Identify any x values for which the expression is undefined : #1). x^2-36/x^2-12x+36 , #2). -x2^2-9x/4x^2-81 Link to problems below just in case. Thanks show wo

Algebra ->  Equations -> SOLUTION: Simplify. Identify any x values for which the expression is undefined : #1). x^2-36/x^2-12x+36 , #2). -x2^2-9x/4x^2-81 Link to problems below just in case. Thanks show wo      Log On


   

Question 1014574: Simplify. Identify any x values for which the expression is undefined :
#1). x^2-36/x^2-12x+36 ,
#2). -x2^2-9x/4x^2-81
Link to problems below just in case. Thanks show workk please
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Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Simplify. Identify any x values for which the expression is undefined :
#1). %28x%5E2-36%29%2F%28x%5E2-12x%2B36%29
the expression is undefined when the denominator = 0, therefore find x when
x^2 - 12x +36 = 0
factors to
(x-6)(x-6) = 0
when x = 6 the expression undefine
:
Same with this one
#2). %28-x2%5E2-9x%29%2F%284x%5E2-81%29
4x^2 - 81 = 0
this is the "difference of squares, it factors to:
(2x - 9)(2x + 9) = 0)
2x = +9
x = 4.5
or
2x = -9
x = -4.5; makes the expression undefined