If $a=2$ and $b=3$, find the value of $ab-a^{2}$.
Given: $a=2$ and $b=3$.
To do: To find the value of $ab-a^{2}$.
Solution:
$ab-a^{2}$
$=a( b-a)$
$=2( 3-2)$
$=2( 1)$
$=2$
Thus, $ab-a^2=2$.
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