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

Question

3u^2-7-21u+49

Would be the same procedure as factoring polynomial?
Thanks!

Answer 1

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.

Answer 2

That's the actual problem on my assignment.

I am so confused!

Answer 3

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.

Answer 4

You are probably right but is what the question in the textbook is.

I am unsure of what the answer is.

Answer 5

I'll admit that if the question is unclear, so will be the answer.

Better check with your teacher.

Answer 6

OK I will gt in touch with the teacher.
Thanks!