Question and Answers Forum

All Questions      Topic List

Coordinate Geometry Questions

Previous in All Question      Next in All Question      

Previous in Coordinate Geometry      Next in Coordinate Geometry      

Question Number 95639 by i jagooll last updated on 26/May/20

find the equation of the circle   containing the point (−2,2) and  passing throught the points of   intersection of the two circle   x^2 +y^2 +3x−2y−4=0 and   x^2 +y^2 −2x−y−6=0

$$\mathrm{find}\:\mathrm{the}\:\mathrm{equation}\:\mathrm{of}\:\mathrm{the}\:\mathrm{circle}\: \\ $$$$\mathrm{containing}\:\mathrm{the}\:\mathrm{point}\:\left(−\mathrm{2},\mathrm{2}\right)\:\mathrm{and} \\ $$$$\mathrm{passing}\:\mathrm{throught}\:\mathrm{the}\:\mathrm{points}\:\mathrm{of}\: \\ $$$$\mathrm{intersection}\:\mathrm{of}\:\mathrm{the}\:\mathrm{two}\:\mathrm{circle}\: \\ $$$$\mathrm{x}^{\mathrm{2}} +\mathrm{y}^{\mathrm{2}} +\mathrm{3x}−\mathrm{2y}−\mathrm{4}=\mathrm{0}\:\mathrm{and}\: \\ $$$$\mathrm{x}^{\mathrm{2}} +\mathrm{y}^{\mathrm{2}} −\mathrm{2x}−\mathrm{y}−\mathrm{6}=\mathrm{0} \\ $$

Commented by i jagooll last updated on 26/May/20

thank you

$$\mathrm{thank}\:\mathrm{you} \\ $$

Answered by john santu last updated on 26/May/20

substitute (−2,2) for (x,y) in the  equation (x^2 +y^2 +3x−2y−4)+λ(x^2 +y^2 −2x−y−6)=0  then λ = (3/2). so desired equation can be  written as 5x^2 +5y^2 −7y−26 = 0

$$\mathrm{substitute}\:\left(−\mathrm{2},\mathrm{2}\right)\:\mathrm{for}\:\left(\mathrm{x},\mathrm{y}\right)\:\mathrm{in}\:\mathrm{the} \\ $$$$\mathrm{equation}\:\left(\mathrm{x}^{\mathrm{2}} +\mathrm{y}^{\mathrm{2}} +\mathrm{3x}−\mathrm{2y}−\mathrm{4}\right)+\lambda\left(\mathrm{x}^{\mathrm{2}} +\mathrm{y}^{\mathrm{2}} −\mathrm{2x}−\mathrm{y}−\mathrm{6}\right)=\mathrm{0} \\ $$$$\mathrm{then}\:\lambda\:=\:\frac{\mathrm{3}}{\mathrm{2}}.\:\mathrm{so}\:\mathrm{desired}\:\mathrm{equation}\:\mathrm{can}\:\mathrm{be} \\ $$$$\mathrm{written}\:\mathrm{as}\:\mathrm{5x}^{\mathrm{2}} +\mathrm{5y}^{\mathrm{2}} −\mathrm{7y}−\mathrm{26}\:=\:\mathrm{0} \\ $$

Terms of Service

Privacy Policy

Contact: info@tinkutara.com