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January 28, 2015

January 28, 2015

Posted by **Emir** on Thursday, August 2, 2012 at 8:38am.

7x(squared)+4x-13=8

- Math -
**Steve**, Thursday, August 2, 2012 at 9:54am7x^2 + 4x - 13 = 8

multiply by 7 to get a perfect square on the 2nd-degree term:

49x^2 + 28x = 147

49x^2 + 28x + 4 = 147 + 4

(7x+2)^2 = 151

7x = -2 ± √151

x = (-2 ± √151)/7

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