2^4х-19=1/8 3^3х-7=1/81 3^2х-19= 1/64

x^2+2x+y^2=16

x+y=16   => y=2-x

x^2+2x+(2-x)^2=16

x^2+2x+4-4x+x^2=16

2x^2-2x-12=0

x^2-x-6=0

d=b^2-4ac=1-4*1(-6)=25

x1,2=(-b±sqrt(d))/2a

x1=(1+5)/2=3

x2=(1-5)/2=-2

при x1=3   y1=2-3=-1

при x2=-2   y2=)=4

x^2y+1-x^2-y

(x^2-1)y-x^2+1

(x-1)*(x+1)*(y-1)