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64a-a3
X^3-10x2+25x
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64A - A^3 = A* ( 64 - A^2) = A * ( 8 - A) * ( 8 + A )=====================================X^3 - 10X^2 + 25X = X * ( X^2 - 10X + 25 )______________________________________X^2 - 10X + 25 D = 100 - 4*25 = 0 X = 10 : 2 = 5 _______________________________________X^3 - 10X^2 + 25X = X * ( X - 5) * ( X - 5 )========================================