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September 19, 2014

September 19, 2014

Posted by **Jayden Haddy** on Saturday, August 3, 2013 at 11:42am.

x(square) -13x + 21 = 0

Then x= or x=

- maths -
**Steve**, Saturday, August 3, 2013 at 2:06pmx^2-13x+21 = 0

x^2-13x+(13/2)^2 + 21 - (13/2)^2 = 0

(x - 13/2)^2 - 85/4 = 0

x - 13/2)^2 = 85/4

x - 13/2 = ±√85/2

x = (13±√85)/2

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