Mathematics 21 Online
OpenStudy (anonymous):

What are the methods in solving a quadratic equation by completing the squares?

OpenStudy (anonymous):

OpenStudy (anonymous):

very funny

OpenStudy (anonymous):

would you like to do an example? $x^2+6x-2=0$ $x^2+6x=2$ $(x+3)^2=2+3^2=2+9=11$ $x+3=\pm\sqrt{11}$ $x=-3\pm\sqrt{11}$

OpenStudy (anonymous):
OpenStudy (anonymous):

if you repeat the method with $ax^2+bx+c=0$ you get $x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$

OpenStudy (anonymous):

Totally forgot that this is how you get the last formula :-) Good to come here

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