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$$ -0.4 \cdot \log(0.4) - 0.3 \cdot \log(0.3) - 0.3 \cdot \log(0.3) = 1.571 $$

The answer is given. How can I calculate the equation for obtaining $1.571$? Please help me understand.

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    Calculate how? on a calculator?2012-12-10
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    @DennisGulko: I think something is wrong at the OP's identity. ??!2012-12-10
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    The question is what do you mean when you write $\log$. Do you mean $\log_{10}$, $\log_e$ or $\log_2$ (the last seems to be the correct, according to WA)2012-12-10
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    They're base-2 logarithms. Otherwise the answer is wrong.2012-12-10

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