Straight line pb 10

Geometry Level pending

Four points A(A,0) B(B,0), c(y, 0) and D( , 0) are such that A and B are the roots of ax^2 + 2hx + b = 0 and C and D are the roots a’x^2 + 2h’x + b’ = 0. If AC/CB =K , and AD/DB = U, and ab’ + ba’ = 2hh’, then the value of K + U =

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