Asked by clary

Factor. Use factoring by grouping even though it would seem reasonable to first combine like terms

3u^2-7-21u+49

Would be the same procedure as factoring polynomial?
Thanks!
Answered by Steve
since you have 3u^2, look for multiples of 3:

3u^2-21u = 3u(u-7)

Work on that idea. But why both the -7 and +49 constant terms?

Looks like a typo to me.
Answered by clary
That's the actual problem on my assignment.

I am so confused!
Answered by Steve
Well, there must be a typo somewhere, because if we say -7+49 = 42, then we have

3u^2-21u+42

and that does not factor.
Answered by clary
You are probably right but is what the question in the textbook is.

I am unsure of what the answer is.
Answered by Steve
I'll admit that if the question is unclear, so will be the answer.

Better check with your teacher.
Answered by clary
OK I will gt in touch with the teacher.
Thanks!

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