X^2=100; x^2=0,25; x^2=-16; x^2=13; 3x^2=0,48; x^2-49=0; 25/36 x^2-1=0; (3x-2) (3x+2)=5; (x+1)^2=64;

1) x^2 = 100,

x =  100,

x1 = - 10,

x2 = + 10;

2) x^2 = 0,25;

x =  0,25;

x1 = - 0,5;

x2 = + 0,5;

3) x^2 = - 16,

Решение нет, так как лева неотрицательное число, а справа отрицательное, они одинаковы быть не могут.

4) x^2 = 13,

x =  13,

x1 = -  13,

x2 = + 13;

5) 3x^2 = 0,48;

x^2 = 0,48/3;

x^2 = 0,16;

x =  0,16;

x1 = - 0,4;

x2 = 0,4;

6) x^2 - 49 = 0;

x^2 = 49;

x =  49;

x1 = - 7;

x2 = + 7;

7) (25/36) * x^2 - 1 = 0,

(25/36) * x^2 = 1,

x^2 = 1/(25/36),

x^2 = 36/25,

x =  (36/25),

x1 = 6/5,

x2 = 6/5;

8) (3x - 2) * (3x + 2) = 0,

a) 3x - 2 = 0,

3x = 2,

x = 2/3;

b) 3x + 2 = 0,

3x = - 2,

x = - 2/3;

9) (x + 1)^2 = 64,

x+1 =  64,

a) x + 1 = - 8,

x = - 8 - 1,

x = = 9;

b) x + 1 = 8,

x = 8 - 1,

x = 7;

10) (4x - 9)^2 = 49,

4x - 9 =  49,

a) 4x - 9 = - 7,

4x = - 7 + 9,

4x = 2,

x = 2/4,

x1 = 1/2;

b) 4x - 9 = 7,

4x = 7 + 9,

4x = 16,

x = 16/4,

x = 4;

11) (x - 3)^2 = 3;

x - 3 =  3;

a) x - 3 = - 3;

x1 = 3 - 3;

b) x - 3 =  3;

x1 = 3 + 3;