If $a = 3$ and $b = - 4$ , evaluate : $2 a^{2} - b^{2}$ .

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Solution

$a = 3$ $b = - 4$
$2 a^{2} - b^{2}$
$\Rightarrow 2 (3)^{2} - (- 4)^{2}$
$\Rightarrow 2 (9) - (16)$
$\Rightarrow 18 - 16 = 2$ .

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