3y2
y x y = y2
3 x y2 = 3y2
3*1/3y = 3*1/3y = 1/y
3*Y. 3 times Y. if Y 3. but ey this is just slang for ey rly. 3y == ey. Imo
9y2
3xy + 3y2 = 3y (x + y)
4xy²(3y-x)-2x²(x-3y)²=4xy²(x-3y)-2x²(x-3y)²=(x-3y)[4xy²-2x²(x-3y)²]=(x-3y)(4xy²-2x³+6x²y)=(x-3y)(-2x³+6x²y+4xy²)=-2x(x-3y)(x²-3xy-2y²)= -2x(x-3y)(x-y)(x-2y)