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December 21, 2014

December 21, 2014

Posted by **theresa** on Saturday, January 27, 2007 at 8:16am.

You can check them by putting in x=1/4 (the second answer), and then x=+- sqrt(1/3) These are three answers that need to be checked.

If the equation balances, the answers are correct.

The other way of checking it is to graph

y=7x^3-x+1-x^3-3x^2-x. yes, combine the terms. Where y is zero, ie, crossing the x axis, that is a real solution.

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