If $a = 2$ and $b = 3$ , find the value of $a^{2} + a b$ .

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Solution

Substitute $2$ for $a$ and $3$ for $b$ in the expression $a^{2} + a b,$
$\begin{matrix} a^{2} + a b & = {(2)}^{2} + 2 \times 3 = 4 + 6 = 10 \end{matrix}$

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