If a line L touches the circle `x^2 + y^2 + 8x + 15 = 0` at A in second quadrant and circle `x^2 + y^2 - 12x + 32 = 0` at B in fourth quadrant and d is distance between A and B then `d^2` is:

Answer

91

Explanation

`C_1D^2 = C_1C_2^2 - C_2D^2 = 100 - 9 = 91`
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