Question

Решите с решением
2) -5x^2 - 125x = 0;
3) -28x^2 - 7x = 0.

Answer 1

Объяснение:

1) 7x^2 - 7x = 0;

7х(х-1)=0

7х=0

Х1=0

Х-1=0

Х2=1

2) -5x^2 - 125x = 0;

-5х(х+25)=0

-5х=0

Х1=0

Х+25=0

Х2=-25

3) -28x^2 - 7x = 0.

-7х(4х+1)=0

-7х=0

Х1=0

4х+1=0

4х=-1

Х=-1:4

Х2=-0,25

Answer 2

Объяснение:

$1.7x(x - 7) = 0 \\ 1)7x = 0 \\ x = 0 \\ 2)x - 7 = 0 \\ x = 7 \\ 2. - 5 {x}^{2} - 125x = 0 \\ \\ 5 {x}^{2} + 125x = 0 \\ 5x(x + 25) = 0 \\ 1)5x = 0 \\ x = 0 \\ 2)x + 25 = 0 \\ x = - 25 \\ 3. - 28 {x}^{2} - 7x = 0 \\ 4 {x }^{2} + x = 0 \\ 4x(x + 1) = 0 \\ 1)x = 0 \\ 2)x = - 1$