The equation is .

Apply addition property of equality: if  then .

(Add 25 to each side)

           (Apply Additive inverse property:  )

                       (Apply Additive identity property: )

Apply division property of equality: if a = b, then.

                 (Divide each side by 5)

                      (Cancel common terms)

                           (Divide: )

Apply multipication property of equality: if a = b, then .

                 (Multiply each side by negative one)

                          (Product of two same signs is positive)

                     (Take square roots each side)

Rewrite the expression using perfect square roots.

Rewrite the expression using product property of square roots;

For nonnegative real numbers a and b, .

Rewrite the () using imaginary unit; that is  where .

                     (Find the square root: )

                       (Multiply: )

The value of .