What should be subtracted from `x^2-x y+y^2-x+y+3` to obtain ` x^2+y^2-4x y+1?`

What should be subtracted from 2x^3 - 3x^2y + 2xy^2 + 3y^3 " to get " x^3- 2x^2y + 3xy^2 + 4y^3 ?

Subtract 3x-4y from -8x-3y

Subtract 3x+2y-z from 4x-5y+3z

Write each of the following statement by using appropriate grouping symbols: The sum of a-b and 3a-2b+5 is subtracted from 4a+2b-7. Three times the sum of 2x+y-{5-(x-3y)} and 7x-4y+3 is subtracted from 3x-4y+7. The subtraction of x^2-y^2+4x y from 2x^2+y^2-3x y is added to 9x^2-3y^2-x ydot

Subtract -4x^2y-y^3 " from " x^3 +3xy^2-x^2y .

Subtract: 7a^2b\ from 3a^2b (ii) 4x y\ from -3x y

Subtract: -4x from 3y\ (ii) -2x\ from -5y