Evaluate ${196 x}^{2} - 56 x y + {4 y}^{2}, i f x = 1, y = 2.$

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Solution

$196 (1)^{2} - 56 (1) (2) + 4 (2)^{2}$
$\Rightarrow 196 - 112 + 16$
$\Rightarrow 100$ .

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