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Question x^3+x^2+x=0 is not a quadratic equation why not

The equation x^2+x^2+ =0 is not a Quadratic Equation, because?

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Daniel E. | Mathematics Made EasyMathematics Made Easy
4.9 4.9 (15 lesson ratings) (15)
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x3+x2+x=0 is not a quadratic equation because it has an x3, this makes it a cubic equation. You can factor out an x to get x(x2+x+1)=0, giving you x times a quadratic equation. 

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