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CBSE Class 10 Answered

Can you please explain the question descriptively?
Asked by BIPLAV BIJOY GOSWAMI | 06 Mar, 2013, 02:44: PM
answered-by-expert Expert Answer
y^2+k^2=2(k+1)y
y^2-2(k+1)y+k^2=0
Here, a = 1, b = -2(k+1), c = k^2
 
Since, roots are equal, D = 0
b^2 - 4ac = 0
4(k+1)^2 - 4k^2 = 0
(k+1)^2 - k^2 = 0
k^2 + 2k + 1 - k^2 = 0
2k+1=0
k=-1/2
Answered by | 06 Mar, 2013, 02:54: PM

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