If $a = 2, b = - 2$ , find the value of :
$a^{2} + a b + b^{2}$

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Solution

$a = 2$ ;
$b = - 2$
$a^{2} + a b + b^{2}$
$= (2)^{2} + 2 (- 2) + (- 2)^{2}$
$= 4 - 4 + 4 = 4$ .

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