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Question
Find the excluded values, of the following expression
`y/(y^2 - 25)`
Solution
The expression `y/(y^2 - 25)` is undefined
when y2 – 25 = 0
y2 – 52 = 0
(y + 5) (y – 5) = 0
y + 5 = 0 or y – 5 = 0
∵ y = – 5 or y = 5
The excluded values are – 5 and 5
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