Question

ДАЮ 50 баллов!!!
Решите по образцу!

Answer 1

Ответ:

1) x^2 - 9 = 0;

x^2 = 9;

x = ±4.

2) 16 - x^2 = 0;

-x^2 = -16;

x^2 = 16;

x = ±4;

3) 5x - x^2 = 0;

x(5 - x) = 0;

x = 0; 5 - x = 0;

-x = -5;

x = 5;

4) 49x^2 - 16 = 0;

49x^2 = 16;

x^2 = 16/49;

x = √(16/49);

x = (√16)/(√49);

x = 4/7;

5) x^2 - 12x = 0;

x(x - 12) = 0;

x = 0; x - 12 = 0;

x = 12;

6) x^2 = 1;

x = ±1;

7) 3x^2 + x = 0;

x(3x + 1) = 0;

x = 0; 3x + 1 = 0;

3x = -1;

x = - (1/3);

8) x - 5x^2 = 0;

x(1 - 5x) = 0;

x = 0; 1 - 5x = 0;

-5x = -1;

x = 0,2;