How do you evaluate $f(x)=log_10x$ for $x=4/5$ ?

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Answer 1 · 2017-06-19T11:25:44

$f(4/5) ~~ -0.097(3dp)$

$f(x)= log_10x ; x=4/5 :. f(4/5)= log_10(4/5) = log_10 4 -log_10 5$

$~~ 0.602-0.699 ~~ -0.097(3dp)$

$f(4/5) ~~ -0.097(3dp)$ [Ans]

How do you evaluate f(x)=log_10xf(x)=log_10x for x=4/5x=4/5?