Question

Решите уравнение: 1)2x^2=72
2) 9x^2-60x+100=0
3)7x^2-14x=0

Answer 1

Ответ:

1) x = -6 ; x = 6;

2) x  = 10/3

3) x = 0 ; x =√2 ; x = -√2

Объяснение:

1) x² = 36 ;

x = -6 ;

x = 6;

2) 9x²-60x + 100 =0

D = 0 ( за формулой)

x = -(-60)/18 = 10/3

3) 7x²=14x

x = 0

x² = 2

x = √2

x = -√2