How to Solve Radical Equations - College Algebra Tips

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Learn How to Solve Radical Equations in this College Algebra tutorial. Then take an online College Algebra course at StraighterLine for college credit.
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Hi there guys, thanks alot for your help. I however have a question. Isn't the squareroot of 16 = +4, -4??? It so, why is the x=-1 solution rejected if it shows that.
Thanks

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