5x-3y+7 dari 7x+15y= -x^ + 6xy+3y^ dari 5x^-9xy-4y^= Tolong d jawab:)

A) (7x+15y)-(5x-3y+7) = 7x+15y-5x+3y-7
= 7x-5x+15y+3y-7 = 2x+18y-7

b) (5x²-9xy-4y²)-(-x²+6xy+3y²)
= 5x²-9xy-4y²+x²-6xy-3y²
= 5x²+x²-9xy-6xy-4y²-3y² = 6x²-15xy-7y²

semoga membantu 😀