LollyLau
  • LollyLau
Can I factor a^2 + 4?
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
No, in general sense.
anonymous
  • anonymous
With imaginary numbers: (a - 2i)(a + 2i)
LollyLau
  • LollyLau
Can we avoid using imaginary numbers?

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slaaibak
  • slaaibak
nope
LollyLau
  • LollyLau
-.-"
anonymous
  • anonymous
a^2 + 4 = (a + 2)^2 - 4a Does this help?
LollyLau
  • LollyLau
I know that :)
anonymous
  • anonymous
There is another formula involving trig, but I don't remember that now.
LollyLau
  • LollyLau
???
anonymous
  • anonymous
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?
LollyLau
  • LollyLau
nope
anonymous
  • anonymous
OK, so that's wrong......
anonymous
  • anonymous
I think you just can't factor it......
LollyLau
  • LollyLau
hopeless...
anonymous
  • anonymous
u can do it using imaginary roots
anonymous
  • anonymous
why are you factoring it ;D
anonymous
  • anonymous
Because that's the question?
radar
  • radar
I can't factor it.........but maybe someone else can.
jagatuba
  • jagatuba
No it cannot be factored without the use of imaginary numbers.

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