Maybe the given instruction is something like this:
"Expand the given expression."
If these two guesses are correct, then you could apply the Distributive Property.
\(\displaystyle (A \;+\; B \;+\; C)^{2} = A \cdot A \;+\; A \cdot B \;+\; A \cdot C \;+\; B \cdot A \;+\; B \cdot B \;+\; B \cdot C \;+\; C \cdot A \;+\; C \cdot B \;+\; C \cdot C\)
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