Consider $\sqrt { 5 - 2 x } + 7 = 4$.

1. Solve the equation and check your solution.

   Hint (a):

   Subtract 7 from both sides and square both sides to remove the square root.

2. Did you really check your solution? If not, do it now. What happened?

   Hint (b):

   $-\sqrt{A}\text{ can equal}-3, \text{ but can}\sqrt{A} = -3?$