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If , then x could be

If image, then x could be


(A) 1
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Nova Math - Problem Set B: Substitution (Plugging in)

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Posted: 11/21/2012 10:55
I know it's hard, but after several steps you should get x^3 (x^3 -5) = 24. If you think carefully, the two factors with a difference of 5 that give a product of 24 are 8 and 3, so x^3=8, which means x=2 (D)
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Posted: 11/21/2012 11:33
Federico, impeccable logic. x=2 is B, though.
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