Let alpha, beta be ral roots of the qua...

Let `alpha, beta ` be ral roots of the quadratic equation`x ^(2)+kx+ (k^(2) +2k-4) =0,` then the minimum value of `alpha ^(z)+beta ^(z)` is equal to :

A

9

B

10

C

11

D

12

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The correct Answer is:

D

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