Question

Can I factor a^2 + 4?

Answer 1

No, in general sense.

Answer 2

With imaginary numbers:
(a - 2i)(a + 2i)

Answer 3

Can we avoid using imaginary numbers?

Answer 4

nope

Answer 5

-.-"

Answer 6

a^2 + 4
= (a + 2)^2 - 4a
Does this help?

Answer 7

I know that :)

Answer 8

There is another formula involving trig, but I don't remember that now.

Answer 9

???

Answer 10

If its a^2 - 4, then,
a^2 - 4
= (a + 2)(a - 2).
But I assume that you've made no mistake in copying the question?

Answer 11

nope

Answer 12

OK, so that's wrong......

Answer 13

I think you just can't factor it......

Answer 14

hopeless...

Answer 15

u can do it using imaginary roots

Answer 16

why are you factoring it ;D

Answer 17

Because that's the question?

Answer 18

I can't factor it.........but maybe someone else can.

Answer 19

No it cannot be factored without the use of imaginary numbers.