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Help in solving a algebra problem

Algebra
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Solve the equation.  x^ - 10x + 20 = 0

Oct 31st, 2014

x^2 - 10x + 20 = 0

x = [10 +- sqrt{ (-10)^2 - 4*1*20} ] / 2*1

   = [ 10 +- sqrt { 100 - 80} ] / 2 

   = [ 10 +- sqrt 20 ] / 2

  = 5 +- sqrt 5

 = 5 + sqrt 5 , 5 - sqrt 5

Oct 31st, 2014

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