If a variable line, 3x+4y−λ=0 is such that the two circles x2+y2− – InterviewSolution

1.	If a variable line, 3x+4y−λ=0 is such that the two circles x2+y2−2x−2y+1=0 and x2+y2−18x−2y+78=0 are on its opposite sides, then the set of all values of λ will lie in the interval:
Answer» If a variable line, $3 x + 4 y - λ = 0$ is such that the two circles $x^{2} + y^{2} - 2 x - 2 y + 1 = 0$ and $x^{2} + y^{2} - 18 x - 2 y + 78 = 0$ are on its opposite sides, then the set of all values of $λ$ will lie in the interval:

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