Question

-15-2x  в квадрате=-11x

 

Answer 1

-15-2х²=-11х

-2х²-15х+11х=0

-2х²-4х=0

2х²+4=0

х²+2=0

Answer 2

 

$-15-2x^2=-11x\ -2x^2 + 11x -15 = 0\ D = 121 - 120 = 1\ x_1 = (-11+1)/(-4)= 2.5\ x_2 = (-11-1)/(-4)= 3$