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Formula
Calculate the value
$\sqrt{ 18 } - \sqrt{ 98 } - \sqrt{ 50 }$
$- 9 \sqrt{ 2 }$
Calculate the value
$\sqrt{ \color{#FF6800}{ 18 } } - \sqrt{ 98 } - \sqrt{ 50 }$
 Organize the part that can be taken out of the radical sign inside the square root symbol 
$\color{#FF6800}{ 3 } \sqrt{ \color{#FF6800}{ 2 } } - \sqrt{ 98 } - \sqrt{ 50 }$
$3 \sqrt{ 2 } - \sqrt{ \color{#FF6800}{ 98 } } - \sqrt{ 50 }$
 Organize the part that can be taken out of the radical sign inside the square root symbol 
$3 \sqrt{ 2 } - \left ( \color{#FF6800}{ 7 } \sqrt{ \color{#FF6800}{ 2 } } \right ) - \sqrt{ 50 }$
$3 \sqrt{ 2 } \color{#FF6800}{ - } \left ( \color{#FF6800}{ 7 } \sqrt{ \color{#FF6800}{ 2 } } \right ) - \sqrt{ 50 }$
 Get rid of unnecessary parentheses 
$3 \sqrt{ 2 } \color{#FF6800}{ - } \color{#FF6800}{ 7 } \sqrt{ \color{#FF6800}{ 2 } } - \sqrt{ 50 }$
$3 \sqrt{ 2 } - 7 \sqrt{ 2 } - \sqrt{ \color{#FF6800}{ 50 } }$
 Organize the part that can be taken out of the radical sign inside the square root symbol 
$3 \sqrt{ 2 } - 7 \sqrt{ 2 } - \left ( \color{#FF6800}{ 5 } \sqrt{ \color{#FF6800}{ 2 } } \right )$
$3 \sqrt{ 2 } - 7 \sqrt{ 2 } \color{#FF6800}{ - } \left ( \color{#FF6800}{ 5 } \sqrt{ \color{#FF6800}{ 2 } } \right )$
 Get rid of unnecessary parentheses 
$3 \sqrt{ 2 } - 7 \sqrt{ 2 } \color{#FF6800}{ - } \color{#FF6800}{ 5 } \sqrt{ \color{#FF6800}{ 2 } }$
$\color{#FF6800}{ 3 } \sqrt{ \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \color{#FF6800}{ 7 } \sqrt{ \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \color{#FF6800}{ 5 } \sqrt{ \color{#FF6800}{ 2 } }$
 Calculate between similar terms 
$\color{#FF6800}{ - } \color{#FF6800}{ 9 } \sqrt{ \color{#FF6800}{ 2 } }$
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