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Calculate the value
Answer
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$- 1$
Calculate the value
$\color{#FF6800}{ 91 } \color{#FF6800}{ \times } \color{#FF6800}{ 89 } - 90 ^ { 2 }$
$ $ Multiply $ 91 $ and $ 89$
$\color{#FF6800}{ 8099 } - 90 ^ { 2 }$
$8099 - \color{#FF6800}{ 90 } ^ { \color{#FF6800}{ 2 } }$
$ $ Calculate power $ $
$8099 - \color{#FF6800}{ 8100 }$
$\color{#FF6800}{ 8099 } \color{#FF6800}{ - } \color{#FF6800}{ 8100 }$
$ $ Subtract $ 8100 $ from $ 8099$
$\color{#FF6800}{ - } \color{#FF6800}{ 1 }$
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