Not so Subtle Roots

Algebra Level 3

x2+x+1=0x^2+x+1 = 0

The roots of the equation above are denoted by rr and ss, while the roots of th equation below are denoted by r3 r^3 and s3s^3 .

ax2+bx+c=0ax^2+bx+c = 0

What is the value of ba - \frac b a ?

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