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What is the sum of all values of y for which the expression \(\frac{y+6}{y^2-5y+4}\) is undefined?

 Jul 16, 2020
 #1
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If we simplify that expression we get: \(\frac{y+6}{(y-1)(y-4)}\). The expression is undefined when the denominator is equal to 0 which is when y=1 or 4. So the sum of 1 and 4 is \(\boxed{5}\)

 Jul 16, 2020
edited by amazingxin777  Jul 16, 2020
 #2
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Thanks!

Unicornrabbit  Jul 17, 2020

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