(2/3)a^2-a-9=0

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Solution for (2/3)a^2-a-9=0 equation: 


a in (-oo:+oo)

(2/3)*a^2-a-9 = 0

2/3*a^2-a-9 = 0

DELTA = (-1)^2-(-9*2/3*4)

DELTA = 25

DELTA > 0

a = (25^(1/2)+1)/(2/3*2) or a = (1-25^(1/2))/(2/3*2)

a = 9/2 or a = -3

a in { -3, 9/2 }

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