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Formula
Calculate the value
$\sqrt{ 72 } \div \left( - \sqrt{ 8 } \right)$
$- 3$
Calculate the value
$\sqrt{ 72 } \div \left ( \color{#FF6800}{ - } \sqrt{ 8 } \right )$
 Move the (-) sign forward 
$\color{#FF6800}{ - } \sqrt{ 72 } \div \sqrt{ 8 }$
$\color{#FF6800}{ - } \sqrt{ \color{#FF6800}{ 72 } } \color{#FF6800}{ \div } \sqrt{ \color{#FF6800}{ 8 } }$
 Calculate the value that contains root 
$\color{#FF6800}{ - } \color{#FF6800}{ \dfrac { \left ( 6 \sqrt{ 2 } \right ) \sqrt{ 2 } } { 4 } }$
$- \color{#FF6800}{ \dfrac { \left ( 6 \sqrt{ 2 } \right ) \sqrt{ 2 } } { 4 } }$
 Reduce the fraction 
$- \color{#FF6800}{ \dfrac { \left ( 3 \sqrt{ 2 } \right ) \sqrt{ 2 } } { 2 } }$
$- \dfrac { \left ( \color{#FF6800}{ 3 } \sqrt{ \color{#FF6800}{ 2 } } \right ) \sqrt{ \color{#FF6800}{ 2 } } } { 2 }$
 Get rid of unnecessary parentheses 
$- \dfrac { \color{#FF6800}{ 3 } \sqrt{ \color{#FF6800}{ 2 } } \sqrt{ \color{#FF6800}{ 2 } } } { 2 }$
$- \dfrac { \color{#FF6800}{ 3 } \sqrt{ \color{#FF6800}{ 2 } } \sqrt{ \color{#FF6800}{ 2 } } } { 2 }$
 Simplify the expression 
$- \dfrac { \color{#FF6800}{ 6 } } { 2 }$
$- \color{#FF6800}{ \dfrac { 6 } { 2 } }$
 Reduce the fraction 
$- \color{#FF6800}{ 3 }$
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