If $x=1,\ y=2$ and $z=5$, find the value of $xy+yz-zx$.
Given: $x=1,\ y=2$ and $z=5$
To do: To find the value of $xy+yz-zx$.
Solution:
$xy+yz-zx$
$=1\times2+2\times5-5\times1$
$=2+10-5$
$12-5$
$=7$
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