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b)-2x+y+9z
2. a) 2x+24y
b) 8y-8x-11
c) -1xpangkat2-15xy
2. =-2x+y-9z
3. = 6x²-12x+15+8x²+6x-14
=14x²-6x+1
bagian pengurangan
1.=(7x+15y) - (5x-9y)
=7x+15y-5x+9y
=2x+24y
2. =(5y-3x-4) - (5x-3xy + 7)
=5y-3x-4-5x+3y-7
=8y-8x-11
3. =(5x²-9xy-4y²) - (-x²+6xy+3y²)
=5x²-9xy-4y²+x²-6xy-3y²
=6x²-15xy-7y²