Решите уравнения

1) (x+9) ²-x (x+8) = 1

2) (x-11) ² = (x-7) (x-9)

3) (x-4) (x+4) - (x+6) ²=-16

4) (1-3x) ²-x (9x-2) = 5

(x+9) ²-x (x+8) = 1

x²+18x+81-x²-8x=1

10x=-80/:10

x=-8

(x-11) ² = (x-7) (x-9)

x²-22x+121=x²-8x-7x+63

x²-22x+121-x²+15x-63=0

-7x+58=0

-7x=-58

x=58/7

x=8 2/7

(x-4) (x+4) - (x+6) ²=-16

x²-16 - (x²+12x+36) = - 16

x²-16-x²-12x-36+16=0

-12x-36=0

-12x=36/: (-12)

x=-3

(1-3x) ²-x (9x-2) = 5

1-6x+9x²-9x²+2x=5

-4x=4/: (-4)

x=-1