How many rational roots does x4 + 3x2 + 2 = 0 have?
0
1
2
4
Caught between 0 and 2 but not sure...

Question

How many rational roots does x4 + 3x2 + 2 = 0 have?
0
1
2
4
Caught between 0 and 2 but not sure...

noelgreco · Answer

Can you factor the expression?

anonymous · Answer

ummmm no, I dont know how to...

noelgreco · Answer

Are you allowed to use a graphing calculator, and if so do you have one?

anonymous · Answer

no just a regular calculator

noelgreco · Answer

Have you factored quadratics such as x^2 -7x+12

anonymous · Answer

its (x-3)(x-4)

noelgreco · Answer

Yes, good.

Can you factor x^2+3x+2?

anonymous · Answer

x(x+5)

noelgreco · Answer

Oops.  If you expand your answer it gives x^2+5x.

It should be (x+2)(x+1), and your original question would factor to (x^2+2)(x^2+1).

Can you find any values of x that would make that product = 0?

I have to run - at least for a while.

anonymous · Answer

ok is it 2

anonymous · Answer

wait none of them equal to 0

anonymous · Answer

well thanks for your time I'm going to go know but whenever you have the chance to answer, I would appreciate it, bye :)

noelgreco · Answer

You say the answer is 2.  Give me a value of x that makes x^2 + 1 = 0