Question

20. If 1/2 is a root of the equation x2 + kx – (5/4) = 0 then the value of k is *

x2 means square of x.

2 points

(A) 2

(B) – 2

(C) 3

(D) –3​

Answer 1

Answer:

Given , 1/2 is a solution of the equation

( \frac{1}{2} )^{2} + k/2 - 5/4 =0(21)2+k/2−5/4=0

or, 1/4 - 5/4 = -k/2

or, -k/2 = -1

or k = 2

Answer 2

Answer:  solution is k=2.

Step-by-step explanation: x2 + kx - (5/4)=0 ; k=?

                                            = x2 + kx - (5/4)=0 , x= 1/2

                                            = 1/4 + k/2 - 5/4 =0

                                            = k/2 - 1 =0

                                         k = 2

           

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