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January 31, 2015

January 31, 2015

Posted by **Anonymous** on Tuesday, June 17, 2014 at 9:00pm.

- algebra -
**Reiny**, Tuesday, June 17, 2014 at 9:27pmso

-2x^2 + 8x + 5 = 0

x^2 - 4x = 5/2

complete the square ...

x^2 - 4x + 4 = 5/2 + 4

(x-2)^2 = 13/2 = 26/4

x-2 = √26/4 ........ since √26 is close to 5

x = appr 2 ± 5/2

= appr 4.5 or .5

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