A word math problem that im confused on where he went wrong (algebra 1)

Question

Brian solved the equation below and got x = 4. Amy looked at his work and said, "I am not so sure, I do not think your solution is correct". If Brian's work is correct, put "4" in the answer box for being correct. If Brian's work is incorrect, solve the equation correctly and put in the correct answer in the box.

(x + 5)^2 − 3x − 9    =   (x − 2)^2

x^2 + 25 −3x − 9     =     x^2 + 4 

       25  − 9 −3x      =      4 

              16 −3x         =      4      

             −3x          =   −12       

                 x            =       4 

Answer 1

No, no, no, no!

Please memorize:

The square of a binomial is the square of the 1st + twice the first times the 2nd + the square of the second.

Say it to yourself enough times to remember it!!

This is where Brian went wrong TWICE. Now you go fix his work.