# How do you insert parentheses to make 18+2*1+3^2 =38  true?

$18 + 2 \cdot \left(1 + {3}^{2}\right)$
$18 + 2 \cdot \left(1 + {3}^{2}\right) = 18 + 2 \cdot \left(1 + 9\right) = 18 + 2 \cdot 10 = 18 + 20 = 38$
The $2 \cdot 1$ multiplication is suspicious, so just play with the parenthesis until the $\cdot 1$ actually has a meaning.