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

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

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.
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