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May 24, 2015

May 24, 2015

Posted by **Sheila** on Wednesday, September 7, 2011 at 4:07pm.

What are the roots of the equation and answers have to be simplified

2x^2 + 5x-10 =0

2x^2 + 5x-10+10=0+10

2x^2 + 5x = 10

2x^2 + 5x/2 = 10/2

2x^2/2 + 5x/2 = 5

x^2 + 5/2x = 5

(5/2 * 1/2)^2 = 5/4^2

x^2 + 5/2x + (5/4)^2 = 5 + (5/4)^2

(x+5/4)^2 = 105/16

x + 5/4 = +minus sqrt 105/16 = sqrt 3^1 * 5^1*7^1 = sqrt 105/4

x= -5/4 + sqrt105/4 or x= -5/4 - sqrt 105/4 Is this correct and simplified thank you Someone suggested a site that will do it but I want to learn on my own

- pre-calculus -
**Writeacher**, Wednesday, September 7, 2011 at 4:09pmONLY the subject area needs to be typed in the School Subject line. You mess yourself up when you do otherwise.