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10-1.Circle and System of Circles
medium

બિંદુ $(2, -3)$  માંથી વર્તૂળ  $x^2 + y^2 + 4x - 6y - 12 = 0$ પર દોરેલા સ્પર્શકોની સ્પર્શ જીવાનું સમીકરણ શોધો.

A

$x - 2y + 4 = 0$

B

$2x - 3y + 4 = 0$

C

$2x +4y + 3 = 0$

D

$4x - 6y + 1 = 0$

Solution

માંગેલ સમીકરણ 

$2x\,\, – \,\,3y\,\, + \;\,4\,\,\left( {\frac{{x\,\, + \;\,\,2}}{2}} \right)\,\, – \,\,6\,\,\left( {\frac{{y\,\, – \,\,3}}{2}} \right)\,\, – \,\,12\,\, = \,\,0$

$ \Rightarrow \,\,2x\,\, – \,\,3y\,\, + \;\,2x\,\, + \;\,4\,\, – 3y\,\, + \;\,9\,\, – \,\,12\,\, = \,\,0\,\,$

$\Rightarrow \,\,4x\,\, – \,\,6y\,\, + \;\,1\,\, = \,\,0$

Standard 11
Mathematics

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