Evaluate 3*(5+4)^2-4^2

$3 \cdot {(5 + 4)}^{2} - 4^{2}$

Simplify each term.

Add $5$ and $4$ .

$3 \cdot 9^{2} - 4^{2}$

Raise $9$ to the power of $2$ .

$3 \cdot 81 - 4^{2}$

Multiply $3$ by $81$ .

$243 - 4^{2}$

Raise $4$ to the power of $2$ .

$243 - 1 \cdot 16$

Multiply $- 1$ by $16$ .

$243 - 16$

$243 - 16$

Subtract $16$ from $243$ .

$227$

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