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find all solutions x^3+49x=0

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1 Answer

Factoring, you get x (x2 + 49) = 0

so x = 0 or x2 + 49 = 0 ==> x2 = -49

If only in the real number system, then x = 0 is the only solution. 

If Complex numbers, then x = 0, x = +7i, x = -7i