YanaseAHotori YanaseAHotori

10-06-2017
Mathematics

contestada

What number must be added to the expression below to complete the square? x2 + 5x
a:25
b:25/4
c:5/2
d:5

Respuesta :

10-06-2017

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.

Answer Link

10-06-2017

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

Answer Link

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