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$4$
Calculate the value
$\left ( \sqrt{ \color{#FF6800}{ 7 } } \color{#FF6800}{ + } \sqrt{ \color{#FF6800}{ 3 } } \right ) \left ( \sqrt{ \color{#FF6800}{ 7 } } \color{#FF6800}{ - } \sqrt{ \color{#FF6800}{ 3 } } \right )$
$ $ Expand the expression using $ \left(a - b\right)\left(a + b\right) = a^{2} - b^{2}$
$\left ( \sqrt{ \color{#FF6800}{ 7 } } \right ) ^ { \color{#FF6800}{ 2 } } \color{#FF6800}{ - } \left ( \sqrt{ \color{#FF6800}{ 3 } } \right ) ^ { \color{#FF6800}{ 2 } }$
$\left ( \sqrt{ \color{#FF6800}{ 7 } } \right ) ^ { \color{#FF6800}{ 2 } } - \left ( \sqrt{ 3 } \right ) ^ { 2 }$
$ $ If you square the radical sign, it will disappear $ $
$\color{#FF6800}{ 7 } - \left ( \sqrt{ 3 } \right ) ^ { 2 }$
$7 - \left ( \sqrt{ \color{#FF6800}{ 3 } } \right ) ^ { \color{#FF6800}{ 2 } }$
$ $ If you square the radical sign, it will disappear $ $
$7 - \color{#FF6800}{ 3 }$
$\color{#FF6800}{ 7 } \color{#FF6800}{ - } \color{#FF6800}{ 3 }$
$ $ Subtract $ 3 $ from $ 7$
$\color{#FF6800}{ 4 }$
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