0
8n2 - 5n - 11 = 8
8n2 - 5n - 19 = 0
This cannot be factorised so use the quadratic formula:
n = [5 +/- sqrt(52 + 4*8*19)]/(2*8)
= [5 +/- sqrt(25 + 608)]/16
= [5 +/- sqrt(633)]/16
= [5 +/- sqrt(25.1595)]/16
= -1.25997 or 1.88497
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