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13-06-2017
Mathematics

contestada

What number must be added to the expression below to complete the square?

x2 - 9x

A .-18/4
B. -9/2
C 81/4
D 9/2

Respuesta :

13-06-2017

Take the 'b' term and divide by 2, then square it.
(-9/2)^2 = 81/4
Letter C

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