Simplify:
$x^{2} + 14 x + 49$

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Solution

We have,
$x^{2} + 14 x + 49$

$\Rightarrow x^{2} + 7 x + 7 x + 49$

$\Rightarrow x (x + 7) + 7 (x + 7)$

$\Rightarrow (x + 7) (x + 7)$

$\Rightarrow (x + 7)^{2}$

Hence, this is the answer.

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