Question 1004101
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Find any value of the variable that make the expression undefined.

Problem 1#  x^2+8x+15 / x^2+9x+18

Problem 2#  4x+1 / x^2-5x+6
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1)  {{{(x^2+8x+15)/(x^2+9x+18)}}}.     x = -6 and x =-3  make the denominator equals zero and the ratio indefinite.


2)  {{{(4x+1)/(x^2-5x+6)}}}.     x = 2  and  x = 3  make the same.


You simply need to find zeroes of denominators.