If $a \clubsuit b = a^2 + 2ab + b^2$ and $2 \clubsuit x = 81$, find the sum of all possible values of $x$.
Question:
If $a \clubsuit b = a^2 + 2ab + b^2$ and $2 \clubsuit x = 81$, find the sum of all possible values of $x$.
Answer:
Let's think step by step.

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-4
If $a \clubsuit b = a^2 + 2ab + b^2$ and $2 \clubsuit x = 81$, find the sum of all possible values of $x$.
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