Переводить на многочлени
1.(x+4)^2
2.(9-y)^2
3.(2x+3)^2
4.(5x-6y)^2
5.(7x^2+2y^3)^2
6.(1/2a-0,2b)^2
Спростіть вираз
1.(x-5)^2-x(x-10)
2.(2m-7n)^2-(4m^2+49n^2)

1. (x+4)^2 = x^2 + 8x + 16

2. (9-y)^2 = 81 - 18y + y^2

3. (2x+3)^2 = 4x^2 + 12x + 9

4. (5x-6y)^2 = 25x^2 - 60xy + 36y^2

5. (7x^2+2y^3)^2 = 49x^4 + 28x^2y^3 + 4y^6

6. (1/2a-0,2b)^2 = 1/4a^2 - 2ab + 0.04b^2

1. (x-5)^2 - x(x-10)

= x^2 - 10x + 25 - x^2 + 10x

= 25

2. (2m-7n)^2 - (4m^2+49n^2)

= 4m^2 - 28mn + 49n^2 - 4m^2 - 49n^2

= -28mn