We can do this in the manner of the previous problems if we wanted to. On the other hand we can notice that the constant is a perfect square and the coefficient of the \({x^2}\) is also a perfect square. We can also notice that that \(2\left( 9 \right)\left( 2 \right) = 36\) and so we can see that this is one of the special forms.

Therefore, the factoring of this polynomial is,

Note that while you don’t need necessarily need to know the special forms if you do and can easily recognize them it will make the factoring easier.