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3 years ago

How the answer would end in 15.81

Mathematics

1 answer:

charle [14.2K]3 years ago

7 0

$\bf \sqrt{250}\implies 15.\underline{81}138830084189665999
\\\\\\
\textit{to \underline{two} decimal places is just}\qquad 15.81$

so.... since the number after .81 is 1, it doesn't really round up to .82, so is just that, 15.81.

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4 years ago

How to solve this problem

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Answer:

Solving the radical $\pm\sqrt{-81}$ we get $\mathbf{\pm9 \ i}$

Step-by-step explanation:

We need to express the radical $\pm\sqrt{-81}$ using the imaginary unit i

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$\pm\sqrt{-81}\\=\pm\sqrt{81}\sqrt{-1}\\=\pm\sqrt{3\times3\times3\times3}i\\ =\pm\sqrt{3^2\times3^2}i\\=\pm3\times3\ i\\=\pm9 \ i$

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