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What is the sum of all values of y for which the expression (y + 1)/(y^2 - 5y + 4 + y^2 - 6y) is undefined?

 Aug 16, 2021
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When the denominator is 0, the fraction is undefined. the denominator in this problem is y^2 -5y +4 +y^2 -6y.

We want this to be 0, so I add that at the end.

y^2 -5y +4 +y^2 -6y=0

We can simplify this.

2y^2 -11y +4=0

Bring that into the quadratic equation, and then you should have the answer.

Hope this helps.

 Aug 16, 2021

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