1) (x+4) ² - (x-2) (x+2) = 0

2) (2x-5) ² - (2x-3) (2x+3) = 0

3) (3x+5) (3x-5) - (3x-1) ²=10

4) 2 (2x+1) ²-8 (x+1) (x-1) = 34

1) x^2+8x+16 - (x^2+2x-2x-4) = 0

x^2+8x+16-x^2-2x+2x+4=0

8x+20=0

8x=-20

x=-2,5

2) 4x^2-20x+25 - (4x^2+6x-6x-9) = 0

4x^2-20x+25-4x^2-6x+6x+9=0

-20x+34=0

-20x=-34

x=1,7

3) 9x^2-15x+15x-25 - (9x^2-9x+1) = 10

9x^2-15x+15x-25-9x^2+9x-1=10

9x=10+25+1

9x=36

x=4

4) 2 (4x^2+4x+1) - 8 (x^2-x+x-1) = 34

8x^2+8x+2-8x^2+8x-8x+8=34

8x=34-2-8

8x=24

x=3