1) x^2 + 4x = 0x(x + 4) = 0x = 0 или x + 4 = 0x = 0 или x = -4
2) -x^2 - 8x = 0-x(x + 8) = 0x = 0 или x + 8 = 0x = 0 или x = -8
3) x^2 - 4 = 0(x - 2)(x + 2) = 0x = 2 или x = -2
4) -x^2 + 1 = 0x^2 - 1 = 0(x + 1)(x - 1) = 0x = -1 или x = 1
5) x^2 - 9 = 0(x + 3)(x - 3) = 0x = 3 или x = -3
6) -x^2 + 16 = 0x^2 - 16 = 0(x + 4)(x - 4) = 0x = 4 или x = -4
1) x^2 + 4x = 0
x(x + 4) = 0
x = 0 или x + 4 = 0
x = 0 или x = -4
2) -x^2 - 8x = 0
-x(x + 8) = 0
x = 0 или x + 8 = 0
x = 0 или x = -8
3) x^2 - 4 = 0
(x - 2)(x + 2) = 0
x = 2 или x = -2
4) -x^2 + 1 = 0
x^2 - 1 = 0
(x + 1)(x - 1) = 0
x = -1 или x = 1
5) x^2 - 9 = 0
(x + 3)(x - 3) = 0
x = 3 или x = -3
6) -x^2 + 16 = 0
x^2 - 16 = 0
(x + 4)(x - 4) = 0
x = 4 или x = -4