First two are correct. I'm not sure what you wrote in the last one, but here it is anyways:
P.S. You brain works just as good as before, if not better.
I'm working on my second homework, as I've mentionned before this is a math class I'm taking to get myself up to college math. I'm starting my master's in Human Ress, but I haven't done math since high school, about 20 years ago. My brain just doesn't work as good as it used too?
If someone would just check if those 3 answers are correct, that would be of great help.
If:
P1= 12x^2-6xy+9y^2
P2= -2x^2+3xy-4y^2
P3= 2x-y^2
And:
M1= -3xy
1) P3-P2
=(2x-y^2)-(-2x^2+3xy-4y^2)
=(2x-y^2)+(2x^2-3xy+4y^2)
=2x+(-y^2+4y^2)+2x^2-3xy
=2x+3y^2+2x^2-3xy
2) P2XP3
=(-2x^2+3xy-4y^2) (2x-y^2)
=(-2x^2)x2x+(-2x^2)x(-y^2)+3xyx2x+3xyx(-y^2)+(-4y^2)x2x+(-4y^2)x(-y^2)
=(-4x^3)+2x^2y^2+6x^2y-3xy^3-8xy^2+4y^4
3)P1/M1
=12x^2-6xy+9y^2
----------------
-3xy
=12x^2 -6xy 9y^2
------ + ----- + ------
-3xy -3xy -3xy
=-4xy^-2+0.5+-3x^-1y
=-4xy^-2-x^-1y+0.5
=-7x^-1y^-1+0.5
=0.5
----
7xy
Those are the first three, I'm trying my best not to check everything with you guys because the homework is extensive and I've already had to ask for a prolongation, which cost me 60$ more (on top of the 350$+ they charged for the class), so believe me when I say that this is important for me and you guys are not wasting your time helping me out.
Thank you so much
Neenoon