Question

$$789 \sqrt{ \frac{ 789 }{ 789 \times 4 \times } }$$

Answer

789/2

Solution


Simplify  \(789\times 4\)  to  \(3156\).
\[789\sqrt{\frac{789}{3156}}\]
Simplify  \(\sqrt{\frac{789}{3156}}\)  to  \(\frac{\sqrt{789}}{\sqrt{3156}}\).
\[789\times \frac{\sqrt{789}}{\sqrt{3156}}\]
Use this rule: \(\sqrt{ab}=\sqrt{a}\sqrt{b}\).
\[789\times \frac{\sqrt{789}}{\sqrt{3156}\sqrt{1}}\]
Simplify  \(\sqrt{3156}\)  to  \(2\sqrt{789}\).
\[789\times \frac{\sqrt{789}}{2\sqrt{789}\sqrt{1}}\]
Simplify  \(\sqrt{1}\)  to  \(1\).
\[789\times \frac{\sqrt{789}}{2\sqrt{789}\times 1}\]
Simplify  \(2\sqrt{789}\times 1\)  to  \(2\sqrt{789}\).
\[789\times \frac{\sqrt{789}}{2\sqrt{789}}\]
Cancel \(\sqrt{789}\).
\[789\times \frac{1}{2}\]
Simplify.
\[\frac{789}{2}\]

Decimal Form: 394.5