(C) If a, b are roots of ax2 + C=0, ac * 0, then a3 + b3 is equal to

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( a x^{2}+c=0 ) ( x=pm sqrt{frac{c}{a}} ) ( x=sqrt{frac{c}{a}},-sqrt{frac{c}{a}} ) ( 2^{3}+b^{3} ) ( =left(frac{c}{a}right)^{3 / 2}-left(frac{c}{a}right)^{3 / 2} ) ( =0 )

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