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

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

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