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10-1.Circle and System of Circles
medium
यदि ${x^2} + {y^2} + px + 3y - 5 = 0$ व ${x^2} + {y^2} + 5x$$ + py + 7 = 0$ परस्पर समकोण पर काटते हैं तो $p$ का मान है
A
$\frac{1}{2}$
B
$1$
C
$\frac{3}{2}$
D
$2$
Solution
(a) लम्बवत् प्रतिच्छेदन के लिये, $2{g_1}{g_2} + 2{f_1}{f_2} = {c_1} + {c_2}$
$ \Rightarrow p\,\,\left( {\frac{5}{2}} \right) + p\,\,\left( {\frac{3}{2}} \right) = – 5 + 7 $
$\Rightarrow p = \frac{1}{2}$
Standard 11
Mathematics