Question
Evaluate: $xz (x^2 + y^2)$ for $x = 2, y = 1$ and $z= 1.$

Answer

For $x = 2, y = 1$ and $z = 1$
$xz (x^2 + y^2)$
$2(1) \times (2^2 + 1^2)$
$2 \times (4 + 1)$
$2 \times 5$
$= 10$

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