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Question
Use the direct method to evaluate :
`(3/5"a"+1/2)(3/5"a"-1/2)`
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Solution
Note: (a+b) (a−b) = a2 − b2
`(3/5"a"+1/2)(3/5"a"-1/2)`
`=(3/5 "a")^2-(1/2)^2`
`=9/25"a"^2-1/4`
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