Question

решите уравнение 20x-(2x+1)^2=4(x+2)-(2x-3)^2

Answer 1

20x-4x^2-1=4x+8-4x^2+9
20x-4x-4x^2+4x^2=8+9+1
16x=18
X=1,125

Answer 2

20х-4х^2+4х+1=4х+8-4х^2-12х+9
20х-4х^2+4х-4х+4х^2+12х=8-1+9
8х=16
х=16/8
х=2

Answer 3

ошибка...

Answer 4

х=0.5