Let's set the roots of three real numbers from left to right as x 1, x2, x3 respectively.

And x2, x3.

Two Real Solutions of-x 2+x =-2x1

Meet x2*x3=-2x 1.

X 1∈(0， 1/8)

So x1* x2 * x3 =-2x12 ∈ (-1/32,0).