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I would first take the 2 out:
2(-x^3 - 6x^2 + 15x + 100)

Now, Im lost lol... havent factored by hand in a while... let me see..

im in diff eqns, we barely factor by hand

actually take -2 out..

Did that...now what?

i think i see a (x+5)^2 somewhere, but not sure yet..

yes...that's part of the answer but how do you know that?

just doin trial and error, let me figure it out lol..

If I am right then we need to find an x^2+10x+25 in there..

You are right...the other part of the answer is an (x - 4)...can't see it.

wait lemme google how to do this, refresh my memory..

omg i just realized how much i hate cubics... forgot how i got the x+5...

me too

wait i think i can check somewhere..

aww wolframalpha is not showing steps..=( when is this due?

Factor by grouping!

okay ive tried gorupin every danged term..

Oh, then never mind. That was just a wild guess.

oh lol, i thought i was goin crazy..

I'm a teacher...was going to teach it tomorrow...but I can wait.

I've been trying to figure it out all day.