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= 8a+4-2a+5 = 8a-2a+4+5
= 6a+9 atau bila difaktorkan : 3(2a+3)
B. 5x²-xy-2y² dari 8x²+4xy+y² = (8x²+4xy+y²) - (5x²-xy-2y²)
= 8x²+4xy+y²-5x²+xy+2y² = 8x²-5x²+4xy+xy+y²+2y²
= 3x²+5xy+3y²