Упрости выражения.

1. 8 - (y+4) (y-4).

2. (3b+5c) (5c-3b) + 9b^2

3. 9x (2-x) + (3x+2) ^2.

4. 4 (x^2+4) - (5x-4) ^2.

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

6. (x-3) ^2 - (x+3) (3-x).

1. 8 - (y+4) (y-4) = 8 - (y²-16) = 8-y²+16=-y²+24

2. (3b+5c) (5c-3b) + 9b^2 = (5c+3b) (5c-3b) + 9b²=25c²-9b²+9b²=

25c²

3. 9x (2-x) + (3x+2) ^2=18x-9x²+9x²+12x+4=

30x+4

4. 4 (x^2+4) - (5x-4) ^2=4x²+16 - (25x²-40x+16) = 4x²+16-25x²+40x-16=

-21x²+40x

5. 3 (x+y) ^2-6xy=3 (x²+2xy+y²) - 6xy=

3x²+6xy+3y²-6xy=3x²+3y²

6. (x-3) ^2 - (x+3) (3-x) = x²-6x+9 - (3+x) (3-x) =

x²-6x+9-9+x²=2x²-6x