Expand: (x + 4)^2.
Note
Use (p + q)^2 = p^2 + 2pq + q^2. Here p = x and q = 4, so the middle term is 2 × x × 4 = 8x.
Expand: (x + 4)^2.
Use (p + q)^2 = p^2 + 2pq + q^2. Here p = x and q = 4, so the middle term is 2 × x × 4 = 8x.