Gujarati
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

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