You can put this solution on YOUR website! Subtract 9 from both sides.
I hope you see that you can factor this easily because 9 is a perfect square (3*3), and that you do not need an 'x' value, and that it is -9.
...
If you memorized you can substitute any perfect square for the '1'.
...
So the solution is,
(x+3)(x-3)=0
...
So, x can = 3 or -3.
That is the same as saying the square root of 9 can be either +3 or - 3, which is true.
...
That suggests we could have solved the problem by taking the square root of each side first.
...
The square root of x^2 is simply + or - x.
The square root of 9 is simply + or - 3.
(