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Formula
Calculate the value
Answer
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$3i \times -3i$
$9$
Calculate the value
$3 \color{#FF6800}{ i } \times \left ( - 3 \right ) \color{#FF6800}{ i }$
$ $ It is $ i \times i = -1$
$3 \color{#FF6800}{ \times } \left ( \color{#FF6800}{ - } \color{#FF6800}{ 1 } \right ) \times \left ( - 3 \right )$
$\color{#FF6800}{ 3 } \color{#FF6800}{ \times } \left ( \color{#FF6800}{ - } \color{#FF6800}{ 1 } \right ) \color{#FF6800}{ \times } \left ( \color{#FF6800}{ - } \color{#FF6800}{ 3 } \right )$
$ $ Multiply the numbers $ $
$\color{#FF6800}{ 9 }$
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