9=a^2-(9a/2)

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Solution for 9=a^2-(9a/2) equation: 


a in (-oo:+oo)

9 = a^2-((9*a)/2) // - a^2-((9*a)/2)

(9*a)/2-a^2+9 = 0

9/2*a-a^2+9 = 0

DELTA = (9/2)^2-(-1*4*9)

DELTA = 225/4

DELTA > 0

a = ((225/4)^(1/2)-9/2)/(-1*2) or a = (-(225/4)^(1/2)-9/2)/(-1*2)

a = -3/2 or a = 6

a in { -3/2, 6 }

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