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Posted by on Friday, June 4, 2010 at 6:28pm.

What number is used to complete the square for the equation y^2 + 16 = -y?

a) 64
b)-.25
c) .25
d) -64

a

  • algebra - , Friday, June 4, 2010 at 7:51pm

    y^2 + 16 = -y?
    1y^2 +1 y = -16
    (1/2)^2 = 1/4 = .25 {so c}
    y^2 + y + .25 = -16+.25 = -15.75
    (y+.5)^2 = -15.75

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