Lil H.

asked • 09/13/21

I need help factoring a 4 term equation.

I need to factor: x3-9x+5x-45

I was asked to factor it, I tried to factor it using double grouping, but I wasn't able to factor it like that. I'd only be able to use double grouping if it was x2-9x+5x-45 instead.

Is there any other possible way to factor it, or could this be a trick question and it's not factorable.

Mark M.

Check the accuracy of your post. It works if the second term is -9x^2
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09/13/21

Lil H.

I just double checked.I wrote it correctly. Would it be not factorable then?
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09/13/21

Lil H.

But then again, my teacher might have had a typo, unless it was a trick question. I will ask her tomorrow when school starts again
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09/13/21

Mark M.

Good idea!
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09/13/21

Robert S.

tutor
I agree with Mark. If it were really -9x, then the expression should have been written as x^3-4x-45.
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09/13/21

Lil H.

I asked my teacher, it was a mistake. The original was a 9x^2 not 9x
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09/13/21

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