Factor the expression over the complex numbers.

Here we are given the expression:

Now let us equate it to zero to find x first,

Now subtracting 18 from the other side,

taking square root on both sides,

So we will get two values of x as ,

Now we can write square root -1 as i,

So our factors become,

The final factored form becomes,

Step-by-step explanation:

1. You must apply the Quadratic formula, which is:

2. Substitute values:

3. Finally, you obtain: