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a. x(4x-y)+2y(-x+2y)
4x kuadrat - xy -2xy +2y kuadrat
4x kuadrat - 3xy + 2y kuadrat
= 4x^2 - xy - 2xy + 4y^2
= 4x^2 + 4y^2 - 3xy
b. 3x(x + 3y) - 5y( 7x - 2y)
= 3x^2 + 9xy - 35xy + 10y^2
= 3x^2 + 10y^2 - 26xy
c. -2x(-x + 2y) + 3y(3x - 2y)
= 2x^2 - 4xy + 9xy - 6y^2
= 2x^2 - 6y^2 + 5xy
d. -5x (-7x + 3y) - 2y(-3x - 2y)
= 35x^2 - 15xy + 6xy + 4y^2
= 35x^2 + y^2 - 9xy