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Maharashtra Class 10 Answered

Show that x=-1 is a tangent to circle x^2+y^2-2=0 at(-1,1)
Asked by Mangalgerenuka | 25 Feb, 2020, 11:34: PM
answered-by-expert Expert Answer
Tangent to the circle x2 + y2 = r2 at the point (x1, y1) is xx1 + yy1 = r2
Tangent to the circle x2 + y2 = 2 at (-1, 1) is x(-1)+y(1)=2
Therefore, -x + y = 2 is a tangent to the circle x2 + y2 = 2 at (-1, 1)
Answered by Renu Varma | 26 Feb, 2020, 10:12: AM

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