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September 3, 2015

Homework Help: Algebra

Posted by Deanna on Friday, December 2, 2011 at 3:11pm.

I am using a TI-83 calculator to find all the solutions to the quadratic equation (5x(Squared) - 80 = 0)by graphing. The answer is supposed to be (-4 and 4) but the calculator comes up with (ERR: NO SIGN CHNG). Can you tell me what I'm doing wrong?

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