Originally Posted by
stapel [snip]
You probably started with something like the following:
. . . . .$\displaystyle 2x(3x\, -\, 24)\, +\, 4(2x\, +\, 4\, +\, 3y)\, -\, 2y(2x\, +\, 2y)\, -\, x(x\, -\, y)$ Line 1
. . . . .$\displaystyle 2x(3x)\, +\, 2x(-24)\, +\, 4(2x)\, +\, 4(4)\, +\, 4(3y)\, -\, 2y(2x)\, -\, 2y(2y)\, -\, x(x)\, -\, x(-y)$ Line 2
. . . . .$\displaystyle 6x^2\, +\, (-48x)\, +\, 8x\, +\, 16\, +\, 12y\, -\, 4xy\, -\, 4y^2\, -\, x^2\, -\, (-xy)$ Line 3
Where did you go from there?
[snip]