Simplification of $(x + 3) (x + 3)$ gives

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Solution

The correct option is A

$(x + 3) (x + 3) = (x + 3)^{2}$
$= x^{2} + 6 x + 9 [using (a + b)^{2} = a^{2} + 2 a b + b^{2}]$

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