Respuesta :

mergl
Completing the square would be (b/2)^2, where b here is equal to 5. (5/2)^2 would be 25/4, which would be choice B. 
irspow
You halve the linear coefficient, square that value, and add it.

In this case the linear coefficient is 5 so:

(5/2)^2

25/4

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