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Question
If f(x) = 2{x} + 5x, where {x} is fractional part function of x, then find `"f"(1/4)`
Solution
f(x) = 2{x} + 5x
`{1/4} = 1/4 - [1/4]`
= `1/4 - 0`
= `1/4`
`"f"(1/4) = 2{1/4} + 5(1/4)`
= `2(1/4) + 5/4`
= `7/4`
= 1.75
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