Question

x<x^2+20 <9Х XDXDXDXD

Answer 1

x-x^2-20-9x=0
-x^2-8x-20=0
D=64-4×(-1)(-20)=64+80=144=12
x1=8-12/2=-4/2=-2
x2=8+12/2=20/2=10
Ответ:-2: 10