x^2 + (a/a+b + a+b/a)x +1 = 0 solve by using quadratic formula
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x
2
+(
a+b
a
+
a
a+b
)x+1=0
⇒x(x+
a+b
a
)+
a
a+b
(x+
a+b
a
)=0
⇒(x+
a+b
a
)(x+
a
a+b
)=0
∴x=−
a+b
a
,−
a
a+b
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