Solve for a (1+2)^2=a

${(1 + 2)}^{2} = a$

Rewrite the equation as $a = {(1 + 2)}^{2}$ .

$a = {(1 + 2)}^{2}$

Simplify ${(1 + 2)}^{2}$ .

Add $1$ and $2$ .

$a = 3^{2}$

Raise $3$ to the power of $2$ .

$a = 9$

$a = 9$

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