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$\sqrt{ 63 } - \sqrt{ 28 }$
$\sqrt{ 7 }$
Calculate the value
$\sqrt{ \color{#FF6800}{ 63 } } - \sqrt{ 28 }$
$ $ Organize the part that can be taken out of the radical sign inside the square root symbol $ $
$\color{#FF6800}{ 3 } \sqrt{ \color{#FF6800}{ 7 } } - \sqrt{ 28 }$
$3 \sqrt{ 7 } - \sqrt{ \color{#FF6800}{ 28 } }$
$ $ Organize the part that can be taken out of the radical sign inside the square root symbol $ $
$3 \sqrt{ 7 } - \left ( \color{#FF6800}{ 2 } \sqrt{ \color{#FF6800}{ 7 } } \right )$
$3 \sqrt{ 7 } \color{#FF6800}{ - } \left ( \color{#FF6800}{ 2 } \sqrt{ \color{#FF6800}{ 7 } } \right )$
$ $ Get rid of unnecessary parentheses $ $
$3 \sqrt{ 7 } \color{#FF6800}{ - } \color{#FF6800}{ 2 } \sqrt{ \color{#FF6800}{ 7 } }$
$\color{#FF6800}{ 3 } \sqrt{ \color{#FF6800}{ 7 } } \color{#FF6800}{ - } \color{#FF6800}{ 2 } \sqrt{ \color{#FF6800}{ 7 } }$
$ $ Calculate between similar terms $ $
$\color{#FF6800}{ 1 } \sqrt{ \color{#FF6800}{ 7 } }$
$\color{#FF6800}{ 1 } \sqrt{ 7 }$
$ $ Multiplying any number by 1 does not change the value $ $
$\sqrt{ 7 }$
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