Solve for x, x³+x²=12 Olympiad Mathematics

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You wrote the quadratic equation the first time as x^+3x+6 then wrote the c term as -6 then used +6 in the quadratic equation formula. Was this just a "typo" or am I missing something?

James-gnru
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This seems a little complicated. 8+4=12. That says immediately that 2 is a root. Divide it out and use quadratic formula like you did to get the complex roots.

alnitaka
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Merci pour ces trucs magnifiques, si vous permettez de résoudre l'équation suivante :
X³+3X²= 112

olympiadmathematique
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you got the delta wrong. it should be 33 because its 9-4(-6)(1) that is 9+24

surina