Answer :

[tex]x^2+12x+36[/tex]

Explanation:

Apply Perfect Square Formula:

[tex](a+b)^2=a^2+2ab+b^2[/tex][tex]\begin{gathered} (x+6)^2=x^2+2*6*x+6^2 \\ (x+6)^2=x^2+12x+36 \end{gathered}[/tex]

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