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\[-2\div \sqrt{5} = (-2\sqrt{5})\div5\]

I don't understand how that is equal.

multiplying numerator and denominator by \(\sqrt5\)
\(\sqrt5\)\(\sqrt5=5\)

Do you have to multiple -2 too, if not, why?

-2 remains as -2, from first step to last answer.....

\(\huge \frac{-2\sqrt5}{\sqrt5\sqrt5}=\frac{-2\sqrt5}{5}\)

Oh my bad, ty, saw it wrong.

no problem...