SOLUTION: list all values for which expression is undefined x+3/x^2+3x-28?

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Question 881196: list all values for which expression is undefined x+3/x^2+3x-28?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
I'm assuming the rational expression is %28x%2B3%29%2F%28x%5E2%2B3x-28%29


The rational expression is undefined when the denominator is zero.


To find the values that make it undefined, set the denominator equal to zero and solve


x^2+3x-28 = 0


(x+7)(x-4) = 0


x+7 = 0 or x-4 = 0


x = -7 or x = 4


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The rational expression is undefined when x = -7 or x = 4 since these values cause the denominator to be zero leading to a division by zero error.