If $z = 10$ , find the value of $z^{3} - 3 (z - 10)$ .

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Solution

$z^{3} - 3 (z - 10)$
$\Rightarrow$ $z^{3} - 3 z + 30$
Substituting $z = 10$
$\Rightarrow$ $(10)^{3} - 3 (10) + 30$
$\Rightarrow$ $1000 - 30 + 30$
$\Rightarrow$ $1000$

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