We can factor the left-hand side of this equation to see that (*x* + 1)^{2} = 16. Then, taking the square root of 16 yields *x* + 1 = ± 4.
Solve the two equations, *x* + 1 = 4 and *x* + 1 = -4,
and we can conclude that the solutions are *x* = 3 and *x* = -5. Phew. It's nice to have some closure on that. |