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#### Guest

##### Guest

I know you are suppose to find the greatest common factor but I cant find one in 18+7x^2-x^4. What do I do since there is no GCF???

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I know you are suppose to find the greatest common factor but I cant find one in 18+7x^2-x^4. What do I do since there is no GCF???

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I mean common factor not GCF

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in my book it explains that you need to look for a common factor first

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.......(x-2)(x+5).........

- Joined
- Apr 6, 2006

- Messages
- 12

what is your book called?

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algebra 1 california edition

CORRECT! So do you see a "common factor"? I don't.brianpadilla said:.......(x-2)(x+5).........

18+7x^2-x^4

OK; make it easier by multiplying by -1:

x^4 - 7x^2 - 18 : get that?

= (x^2 - 9)(x^2 + 2) : ok? same way as you got (x-2)(x+5).

Now, you can factor x^2 - 9, right?

(x - 3)(x + 3)

So you end up with:

(x^2 + 2)(x - 3)(x + 3)

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thx