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Solve by factorization
X2 +(a/a+b + a+b/a)x+1 = 0
X2 +(a/a+b + a+b/a)x+1
=> X2 +(a/a+b x a+b/ax + a/a+b .a+b/a)
=> X[x+a/a+b] +a+b/a[a+a*a+b]= 0
=> X= -a*a+b x= (-a+b/a) a+b ≠ 0
The sum of the series 1+1/2+1/4+......is
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3456+3694
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