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Karan Sharma

· started a discussion

· 1 Months ago

Solution required (Question:273458.0)

Detail Solution required

Question:

For what minimum of k, x2 – 2(k – 1)x + (2k + 1) = 0 has positive roots.

Options:
A)

1

B)

-12    

C)

4

D)

0

Solution:

Ans: (c)

 

Knowledge Expert

· commented

· 1 Months ago

Dear student
We can solve through the options.
Put K=4
x^2 - 2(k - 1)x + (2k + 1)
x^2 - 2(4 - 1)x + (8 + 1)
x^2 - 6x + 9
x^2 - 3x - 3x + 9
x(x - 3) - 3(x - 3)
(x - 3) (x - 3)
x = 3 , 3

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