If (2, 4) is a point interior to the circle x2+y2−6x−10y+λ=0 and the circle does not cut the axes at any point, then
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a
λ ∈ (25, 32)
b
λ ∈ (9, 32)
c
λ ∈ (32, ∞)
d
none of these
answer is A.
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Detailed Solution
We have, x2+y2−6x−10y+λ=0 …(i)The circle does not cut the coordinate axes. Therefore, 9-λ<0 and 25-λ<0 [Using : g2-c<0, f2-c<0]⇒ λ>25 ...(ii)It is given that the point (2, 4) lies inside the circle (i).∴ 4+16−12−40+λ<0⇒λ<32 … (iii) From (ii) and (iii), we get λ∈(25, 32) ...(iii)