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 example---replacing 4 with whatever number is being subtracted from x squared.

That one is (x-2)(x+2).

Another example:

x^2-16 = (x-4)(x+4)

You can even do this:

x^4-16 = (x^2-4)(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.

## Answer This Question

## Related Questions

- Algebra - Help me factor this it's so easy I am not getting it figured out! 8x^2...
- math(EASY BUT CHECKING) - for a spinner numbered one to ten, all outcomes are ...
- Algebra 1 - How to factor 10k^2+35k+15 completely? I would start with the easy: ...
- "EASY" Algebra - Im not sure how to do this. (5q^3)(-12q^-4n^4) So far what i ...
- Chemistry - I Have Two Questions 1)How would you calculate the number of ...
- math - how would you simplify y= (x^5-32)/(x-2)? I know that it would equal (x^5...
- algebra - The first three equations I have solved, I would just appreciate ...
- Algebra - The first three equations I have solved, I would just appreciate ...
- algebra - .2x^2 + .31x - 0.15 = 0 I dont see an easy factor here, Recommend the ...
- Algebra - How to factor 6x^3 + 12x^2 + 4x + 8? I keep getting (6x^2 + 4)(x + 2).

More Related Questions