Evaluate (m-3)(m+3)

$(m - 3) (m + 3)$

Expand $(m - 3) (m + 3)$ using the FOIL Method.

Apply the distributive property.

$m (m + 3) - 3 (m + 3)$

Apply the distributive property.

$m \cdot m + m \cdot 3 - 3 (m + 3)$

Apply the distributive property.

$m \cdot m + m \cdot 3 - 3 m - 3 \cdot 3$

Simplify terms.

Combine the opposite terms in $m \cdot m + m \cdot 3 - 3 m - 3 \cdot 3$ .

Reorder the factors in the terms $m \cdot 3$ and $- 3 m$ .

$m \cdot m + 3 m - 3 m - 3 \cdot 3$

Subtract $3 m$ from $3 m$ .

$m \cdot m + 0 - 3 \cdot 3$

Add $m \cdot m$ and $0$ .

$m \cdot m - 3 \cdot 3$

Simplify each term.

Multiply $m$ by $m$ .

$m^{2} - 3 \cdot 3$

Multiply $- 3$ by $3$ .

$m^{2} - 9$