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September 30, 2014

September 30, 2014

Posted by **kaitlin** on Thursday, December 3, 2009 at 11:17pm.

Solve by completing the square

- math -
**Reiny**, Thursday, December 3, 2009 at 11:28pm2x^2+x = 28

divide by 2

x^2 + x/2 = 14

add 1/16 to both sides

x^2 + x/2 + 1/16 = 14 + 1/16

x+1/4)^2 = 225/16

x + 1/4 = ± 15/4

x = -1/4 ± 15/4 = 7/2 or -4

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