(x-1)*(x/2)=66

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Solution for (x-1)*(x/2)=66 equation: 


x in (-oo:+oo)

(x/2)*(x-1) = 66 // - 66

(x/2)*(x-1)-66 = 0

1/2*x*(x-1)-66 = 0

1/2*x*(x-1)-66 = 0

1/2*x^2-1/2*x-66 = 0

1/2*x^2-1/2*x-66 = 0

1/2*x^2-1/2*x-66 = 0

DELTA = (-1/2)^2-(-66*1/2*4)

DELTA = 529/4

DELTA > 0

x = ((529/4)^(1/2)+1/2)/(1/2*2) or x = (1/2-(529/4)^(1/2))/(1/2*2)

x = 12 or x = -11

(x+11)*(x-12) = 0

(x+11)*(x-12) = 0

( x+11 )

x+11 = 0 // - 11

x = -11

( x-12 )

x-12 = 0 // + 12

x = 12

x in { -11, 12 }

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