1) (3x-17y+35z)+(4x+23y-9z)= 2)kurangkanlah: a)5x-9 dengan 7x+15y b)5x-3y+7 dari 5y - 3x - 4 c)-x²-6xy+3y²dari 5x²-9xy-4y²

1. 7x+6y+26z

2. a (7x+15y)-(5x-9) = 2x+15y+9
b (5y-3x-4)-(5x-3y+7) = -8x+8y-11
c (5x²-9xy-4y²)- (-x²-6xy+3y²) = 6x²-3xy-7y²

1). (3x-17y+35z)+(4x+23y-9z)
=3x-17y+35z+4x+23y-9z
=3x+4x-17y+23y+35z-9z
=7x+6y+26z

2). a. 5x-9-7x+15y=5x-7x-9+15y= -2x-9+15y
b. 5y-3x-4-5x-3y+7=5y-3y-3x-5x-4+7
=2y-8x+3
c. 5x²-9xy-4y²-(-x²)-6xy+3y²
=5x²-(-x²)-9xy-6xy-4y²+3y²
=5x²-15xy-y²