SOLUTION: list all numbers for which the rational expression is undefined. x^2-5x-36 / x*2-16 a. -9,4 b. -9 c, -4,9 d, -4,4 Is the answer c? This is what i got, because my fraction has

Question 314812: list all numbers for which the rational expression is undefined.
x^2-5x-36 / x*2-16
a. -9,4
b. -9
c, -4,9
d, -4,4 Is the answer c? This is what i got, because my fraction has a 0 numerator.
Answer by malaydassharma(59) (Show Source): You can put this solution on YOUR website!
After factorisation , the expression can be written as
[(x-9)(x+4)]/[(x-4)(x+4)]
S, the expression is undefined when,
[(x-4)(x+4)]=0
ie at x=4 and x=-4
Hence, ans is (d)