# (n + 7)(n + 9) = ?

$$n^{2}+16 n+63$$

Explanation

When multiplying binomials use the FOIL method which has you multiply the First two terms in each binomial:
$$n \times n = {n^2}$$
Then multiply the Outside two terms in each binomial:
$$n \times 9=9 n$$
Then multiply the Inside two terms in each binomial:
$$7 \times n=7 n$$
Then multiply the Last two terms in each binomial:
$$7 \times 9=63$$
$${n^2} + 9n + 7n + 63 = {n^2} + 16n + 63$$