Question

if x^2 +2kx+4=0has a root x=2 then find the value of k

Answer 1

-2 is the right answer

Answer 2

x=2

=2^2+2^k^2 +4
=4+4k+4
= 8+4k
= 8+4k =0
=4k =-8
= k=-8/4
=k= -2

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