Question

Решите этопж срочно!!! ДАЮ 15!!!!!!!

Answer 1

Ответ:

5) 8х^2=8; x=1

6) x^2 - 4x = 0;

   x(x-4)=0

   x=0; x= 4;

7) x = -4x-5

   x +4x = -5

   5x = -5

   x = -1;

8) 2x^2 +7x+3=0

D = 49 -24= 25

X1 = (-7-5)/4= -3

X2 = (-7+5)/4 = -0.5

9) -x^2 - 2x +3=0 | *(-1)

   x^2 +2x -3=0

x1 +x2 = -2

x1 *x2 = -3

x1 = -3

x2 = 1