Thanks for the reply, Astronuc.
I actually meant magnetic nozzle not MHD. The magnetic nozzle's magnetic field will be used to generate electricity, similar to z-pinch designs which make electricity for the capacitor bank.
I was under the impression Zubrin's NSWR was feasible, but too Dr...
Yeah, that just helps me when grouping. Our homework and tests are online this semester. I have a notebook where I write the problems down, solve em, type the answers on the comp.
Side question, is there a link or thread on how to write codes or bb codes when posting.
For example, the double...
Ok.
I made a mistake I wrote +13x. it's -13x.
In this previous problem 7x^2 + 7x - 15x -15 = 0
for the second group (-15x-15), did we factor out a -15 and arrive to -15(x+1)?
##42x^2 + 49x - 36x - 42 = 0##
I keep trying to bring down the -36, and then dividing the -36 with the -42.
-36x-42=0
-36(x+42/36)
And then move on to the other group[##42x^2]
Do all the terms need to have a common factor to pull out.
In this problem ##42x^2 +13x -42 = 0##.
1 is the only common factor.
So, I multiply 42*(-42)=-1764
36, -49 multiply to -1764 and add to -13.
I once again get stuck like in the original problem.
##7x^2 +36x - 49x - 42 = 0## or...
Should I memorize the formula?
Also when I grouped using ##7x^2 -15x + 7x - 15 = 0## I get (x-15/7)(7x+7).
When I switched to the way you wrote it ##7x^2 +7x - 15x - 15 = 0##, I get (x+1)(7x-15).
my homework helper software confirms the answer is (x+1)(7x-15).
My other question is, am I...
Oh, gotcha. Isn't that what I did in my original post? I thought you are suppose to keep the -105 in the equation like this.
##7x^2 +7x | - 15x - 105 = 0##
And then group.
You've lost me. Is that Reverse FOIL? BTW, is the equation a Non-monic Trinomial? I'm looking through my notes to see which method to use, and Non-monic trinomials seem like the one to use.