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MATH / If r is a root of x²+2x−15=0, what is the greatest possible value of (r³−1)/(r⁵+r⁴−r³−r²)? Express your answer as a common fraction. · Discussion

Discussing If r is a root of x²+2x−15=0, what is the greatest possible value of (r³−1)/(r⁵+r⁴−r³−r²)? Express your answer as a common fraction. · MATH

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