For What Values Of λ Will The Line y = 2x + λ Be A Tangent To The Circle x2+ y2 = 5.

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For what values of λ will the line y = 2x + λ be a tangent to the circle x2y2 = 5.


Correct option is


Comparing the given line with y = mx + c, we get   

m = 2, c = λ and given circle with x2 + y2 = a2  

Then            a2 = 5

∵ Condition for tangency is 





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