# Thread: factor x^2 + 4?

1. ## factor x^2 + 4?

hi can you factor x^2 + 4? No right?

2. ## Re: factor x^2 + 4?

Originally Posted by sakonpure6
hi can you factor x^2 + 4? No right?
That depends. If you are factoring over the real numbers then no, it doesn't factor. If you are factoring over the complex numbers then yes, it factors:
$x^2 + 4 = (x + 2i)(x - 2i)$

-Dan