Solve for x.
= 5 .
a) x = 20
b) x = 25
c) x = 0
d) x = 5

The correct answer is:  [A]:  " x = 20 " .

Explanation:

Given:

  √(x +5) = 5  ;  Solve for "x" .

 "Square" EACH SIDE of the equation ; 
       that is;  raise EACH SIDE of the equation to the 2nd power ;
       to get rid of the "square root" on the "left-hand side" of the equation ;

            [ √(x + 5) ] ²  =  (5)²   ;
 
to get:    (x + 5) = 25 ;

        ↔   x + 5 = 25 ;

               Subtract "5" from EACH SIDE of the equation ;
to isolate "x" on one side of the equation ; and to solve for "x" ;

              x + 5 − 5 = 25 − 5  ;

to get:         x = 20 ;  which is:  Answer choice:  [A] .