( x - 3 ) ( x + 3 )
( x - 3 )(x - 2 )
( x + 9 ) ( x + 1 )
x^2 + 10x + 9
( x - 7 )(x + 7 )
( x - 7 )( x + 1 )
x^2 - 6x - 7
x^2 + 14x + 49
x^2 - 49
( x - 3 )^2
x^2 - 6x + 9
x^2 + 6x + 9
x^2 - 9
x^2 - 5x + 6
x^2 - 14x +49
( x + 7 )^2
x^2 - 7x + 6
( x + 3 ) ( x + 3 )
( x - 7 )^2
( x - 6 )( x - 1 )
