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For what real values of a is the expression (a+3)/(a^2-4a + 1) undefined? List your answers in increasing order separated by commas.

 Dec 19, 2020
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Whenever the denominator = 0    the fxn is undefined

   using Quadratic Formula , we find   that the zeroes are at a = 2 +- sqrt 3

 Dec 20, 2020

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