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Question
Expand.
`(1/y + 4)(1/y - 9)`
Sum
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Solution
`(1/y + 4)(1/y - 9)`
= `(1/y)^2 + {4 + (-9)}1/y + (4) xx (-9)`
= `1/y^2 + (-5) xx 1/y -36`
= `1/y^2 -5/y - 36`
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