જો ચલિત રેખા \(3 x+4 y=\alpha\) એ બે વર્તુળો \((x-1)^{2}+(y-1)^{2}=1\) અને \((x-9)^{2}+(y-1)^{2}=4\) ની વચ્ચે એવી રીતે આવેલ છે કે જેથી તે બંને વર્તુળની એકપણ જીવાને છેદતી નથી તો \(\alpha\) ની બધીજ પૃણાંક કિમંતોનો સરવાળો મેળવો.

A \(164\)
B \(166\)
C \(165\)
D \(199\)

Verified Solution

Answer & Solution

Correct Answer

(C) \(165\)

Step-by-step Solution

Detailed explanation

Both centres should lie on either side of the line as well as line can be tangent to circle. \((3+4-\alpha) \cdot(27+4-\alpha)\,<\,0\) \((7-\alpha) \cdot(31-\alpha)<0 \Rightarrow \alpha \in(7,31) \quad \ldots(1)\) \(d_{1}=\text { distance of }(1,1) \text { from line }\)…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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