If $x=1,\ y=2$ and $z=5$, find the value of $x^{2}+y^{2}+z^{2}$.
Give: $x=1,\ y=2$ and $z=5$.
To do: To find the value of $x^{2}+y^{2}+z^{2}$.
Solution:
$x^{2}+y^{2}+z^{2}$
$=1^2+2^2+5^2$
$=1+4+25$
$=30$
Thus, the value of $x^{2}+y^{2}+z^{2}=30$.
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