1.
16x²-24xy+9x²-(6x²-10xy+3xy-5y²)=16x²-24xy+9y²-6x²+7xy+5y²=10x²-17xy+14y²
2.
1) xy²·(25x-4y²)
2) 5(3-a)²
3. ???
4. (x,y)=(-3,2)
5. ???
6.
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Answers & Comments
1.
16x²-24xy+9x²-(6x²-10xy+3xy-5y²)=16x²-24xy+9y²-6x²+7xy+5y²=10x²-17xy+14y²
2.
1) xy²·(25x-4y²)
2) 5(3-a)²
3. ???
4. (x,y)=(-3,2)
5. ???
6.