(x + 3)(x + 4y)
The given quadratic expression can not be factorized because its discriminant is less than zero.
If you mean: 3x+12 then it is 3(x+4) when factorized
You cannot add them. The 'y' in the 4xy means that you cannot add it to 3x, since the 'y' is an extra component that the 'x' does not have. You can add 3x to 3x, or 4y to 4y, but you cannot add terms which contain different variables to each other. (It's like trying to add apples and oranges, they're not the same thing).
6x^2 -13x+6 = (3x-2)(2x-3) when factorized
The given quadratic expression is (3x+4)(x-4) when factorized
It is: x(x-3) factorized
It is 4xy.
It is 4xy.
4xy + x3y + yx2 + yx + 3yx = x3y + x2y + 8xy = (xy)(x2y + x + 8)
It is 4xy.
2y + 2xy' + 4y + 4xy' = 0 6y + 6xy' = 0 y' = -y/x