Posted by thethe on Sunday, August 25, 2013 at 1:54pm.
How do you factor x^2+4
this should be easy, but I'm not quite getting it

algebra  allie, Sunday, August 25, 2013 at 3:08pm
It's a difference of two squares. It'll be (x+sqrt(4)) and (x(sqrt(4)), for examplereplacing 4 with whatever number is being subtracted from x squared.
That one is (x2)(x+2).
Another example:
x^216 = (x4)(x+4)
You can even do this:
x^416 = (x^24)(x^2+4) 
algebra  thethe, Sunday, August 25, 2013 at 6:03pm
No. I figured it out and it is an imaginary number. Try foiling what u said. It doesn't work.