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Factor 3x^4-12x^2

Mathematics
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What do those two terms have in common?
\[3x^2(x^2-4)=3x^2(x+a)(x-a)\]
3x^2

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Other answers:

So you need to factor out 3x^2
I did
What is the other factor?
x^4-4
|dw:1359238787009:dw|
Yup thats what i got
If you multiply that, using the distributive property, do you get 3x^4-12x^2?
Nope
Then that can't be correct. It would be like me saying that the factors of 8 are 3 and 9. You would say that's not right because 3 time 9 is not 8. And you would be right.
So you have to write factors that multiply back to 3x^4-12x^2
3x^2(x-2)(x+2)
Very good!!
Thanks for the help!
yw

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