Expand: (a – 7)^2.
Note
Use (p - q)^2 = p^2 - 2pq + q^2. The last term is still positive because (-7)^2 = 49.
Expand: (a – 7)^2.
Use (p - q)^2 = p^2 - 2pq + q^2. The last term is still positive because (-7)^2 = 49.