Question

Solve:
1- 6(2x+y-7xy) -3(5x-2y+5xy)
2- 4(2x-3y+xy) -5(3x-2y-xy)
3- x(x²+2xy+y²) +4y(x²+3xy+9y²)
4- x²(x²+xy+y²) -y²(x²-xy-y²)
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Answer 1

Answer:

1. 6(2x+y-7xy) -3(5x-2y+5xy)

12x + 6y - 42xy - (15x - 6y + 15xy)

12x + 6y - 42xy - 15x +6y - 15xy

- 3x + 12y - 57xy

2. 4(2x-3y+xy) -5(3x-2y-xy)

8x - 12y + 4xy - 15x + 10y + 5xy

- 7x - 2y + 9xy

3. x(x²+2xy+y²) +4y(x²+3xy+9y²)

${x}^{3} + 2 {x}^{2} y + x {y}^{2} + 4 {x}^{2} y + 12x {y}^{2} + 36 {y}^{3}$

${x}^{3} + 36 {y}^{3} + 6 {x}^{2} y + 13x {y}^{2}$

4. x²(x²+xy+y²) -y²(x²-xy-y²)

${x}^{4 } + {x}^{3} y + {x}^{2} {y}^{2} - {x}^{2} {y}^{2} + x {y}^{3} + {y}^{4}$

${x}^{4} + {y}^{4} + {x}^{3} y + x {y}^{3}$

Hope this helps.

Someone please correct me if I'm wrong I'm too lazy to recheck.