I am solving Co-ordinate geometry by S.L. Loney. I am stuck on a problem on circles involving tangents and chords. I am not sure, if my approach is correct to solving this problem. Any inputs, tips that would lead me to correctly solve this problem would help!
Tangents are drawn to circle $x^2+y^2=12$ at the points where it is met by the circle $x^2+y^2-5x+3y-2=0$. Find the point of intersection of these tangents.
Solution(My attempt).
The two circles have a common chord. If $(x_1,y_1)$ be the required, the chord of contact of the tangents drawn to the circle $x^2+y^2=12$ is:
$$xx_1+yy_1=12$$
But, the chord of contact of the tangents drawn through $(x_1,y_1)$ to the circle $x^2+y^2-5x+3y-2=0$ is:
$ xx_{1}+yy_{1}+g(x+x_{1})+f(y+y_{1})+c=0\\ xx_{1}+yy_{1}-\frac{5}{2}(x+x_{1})+\frac{3}{2}(y+y_{1})-2=0\\ 2xx_{1}+2yy_{1}-5(x+x_{1})+3(y+y_{1})-4=0\\ x(2x_{1}-5)+y(2y_{1}+3)-5x_{1}+3y_{1}-4=0 $
I am comparing the above two equations and attempting to solve for $x_{1},y_{1}$. Am I thinking on the right lines?