posted by thethe on .
How do you factor x^2+4
this should be easy, but I'm not quite getting it
It's a difference of two squares. It'll be (x+sqrt(4)) and (x-(sqrt(4)), for example---replacing 4 with whatever number is being subtracted from x squared.
That one is (x-2)(x+2).
x^2-16 = (x-4)(x+4)
You can even do this:
x^4-16 = (x^2-4)(x^2+4)
No. I figured it out and it is an imaginary number. Try foiling what u said. It doesn't work.