10-1.Circle and System of Circles
medium

यदि वृत्त ${x^2} + {y^2} + 2x + 2ky + 6 = 0$ तथा ${x^2} + {y^2} + 2ky + k = 0$ परस्पर समकोण पर काटते हैं, तो $k$ का मान है

A

$2$ या $ - \frac{3}{2}$

B

$-2$ या $\frac{3}{2}$

C

$2$ या $\frac{3}{2}$

D

-$2$ या -$\frac{3}{2}$

(IIT-2000)

Solution

(a) $2gg' + \,2ff' = c + c'\,$ ==> $\,2.1.0 + 2.\,k.\,k. = 6 + k$
या $2{k^2} – k – 6 = 0$ ==> $(2k + 3)\,(k – 2) = 0$
$\therefore \,$$k = 2,\, – \frac{3}{2}.$

Standard 11
Mathematics

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