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4x²-9x²+4xy+3xy-5y²+6y²
-5x²+7xy+y² (A)
(2a+3b-5)+(6a-4b+9)
2a-3b-5+6a-4b+9
2a+6a-3b-4b-5+9
8a-7b+4 (A)
jawabannya a. -5x²+7xy+y²
15.2a+3b-5+(6a-4b+9)=2a+3b-5+6a-4b+9=2a+6a+3b-4b-5+9=8a-b+4
jawabannya b. 8a-b+4