Question 81289
15nSQUARED-3=4n
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15n^2-4n-3 = 0
n = [4+-sqrt(4^2-4*15*-3)]/30

n = [4+-sqrt(180)]/30

n = [4+-6sqrt5]/30

n = (2/15) +(1/5)sqrt5 or n = (2/15)-(1/5)sqrt5

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Cheers,
Stan H.