Salve by gauss jueabis method if iteration mothere aitration 4X+0.024x2-0.08x3=8
0.09x1+3x2-0.15x3=9
0.04x1+-0.08x2+4x3=20
​

4x\cdot \:1000+0.024x^2\cdot \:1000-0.08x^3\cdot \:1000=8\cdot \:1000

4000x+24x^2-80x^3=8000

4000x+24x^2-80x^3-8000=8000-8000

-80x^3+24x^2+4000x-8000=0

hello from mrbilldoesmath!

answer:   x^2 + y^2 = 1024

discussion:

the equation of a circle with center (h,k) and radius "r" is

(x-h)^2 + (y-k)^2 = r^2.

in our case

(x-0)^2 + (y-0) ^2 = 32^2 = 1024

you,

mrb