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Question
Simplify:
`(2^-3-2^-4)(2^-3+2^-4)`
Sum
Solution
`(2^-3-2^-4)(2^-3+2^-4)`
`=(2^-3)^2-(2^-4)^2`
`{∵("a"-"b")("a"+"b")="a"^2-"b"^2}`
`=2^-6-2^-8=1/2^6-1/2^8`
`=1/64-1/256`
`=(4-1)/256=3/256`
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