I have a huge headache and I can't understand why this works... I am reviewing the quadratic formula so that I can solve trig questions, but I am stuck on this one part...(adsbygoogle = window.adsbygoogle || []).push({});

The point is to factor [tex]x^2+2x-1[/tex]

I ( and the textbook ) use the quadratic formula to get the roots of it and come up with

[tex]-1\pm\sqrt{2} [/tex]

How do I use this to factor into [tex](x+1-\sqrt{2})(x+1+\sqrt{2})[/tex]?

I remember the quadratic formula as being more useful for solving quadratics where 1 side =0... I don't remember factoring with it! Can someone help? I would try to figure it out on my own but my head is spinning and I am under time pressure at this point. Thanks alot guys.

I really do appreciate the help that I recieve on these boards.

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# Factoring with the quadratic formula

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