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A in (-oo:+oo)
(A-(2/3))^2 = 4/25 // - 4/25
(A-(2/3))^2-(4/25) = 0
(A-2/3)^2-4/25 = 0
(25*(A-2/3)^2)/25-4/25 = 0
25*(A-2/3)^2-4 = 0
25*A^2-100/3*A+64/9 = 0
25*A^2-100/3*A+64/9 = 0
25*A^2-100/3*A+64/9 = 0
DELTA = (-100/3)^2-(4*64/9*25)
DELTA = 400
DELTA > 0
A = (400^(1/2)+100/3)/(2*25) or A = (100/3-400^(1/2))/(2*25)
A = 16/15 or A = 4/15
(A-4/15)*(A-16/15) = 0
((A-4/15)*(A-16/15))/25 = 0
((A-4/15)*(A-16/15))/25 = 0 // * 25
(A-4/15)*(A-16/15) = 0
( A-16/15 )
A-16/15 = 0 // + 16/15
A = 16/15
( A-4/15 )
A-4/15 = 0 // + 4/15
A = 4/15
A in { 16/15, 4/15 }
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