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Question
Find the excluded values, of the following expression
`(x^2 + 6x + 8)/(x^2 + x - 2)`
Solution
x2 + 6x + 8 = (x + 4) (x + 2)
x2 + x – 2 = (x + 2) (x – 1)
`(x^2 + 6x + 8)/(x^2 + x - 2) = ((x + 4)(x + 2))/((x + 2)(x - 1))`
= `(x + 4)/(x - 1)`
The expression `(x + 4)/(x - 1)` is undefined
when x – 1 = 0
∵ x = 1
The excluded value is 1
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