Question 1153436
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On quadratic formula, see the lessons

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/quadratic/lessons/Introduction-Into-Quadratics.lesson>Introduction into Quadratic Equations</A>

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/quadratic/lessons/proof-of-quadratic-by-completing-the-square.lesson>PROOF of quadratic formula by completing the square</A>

in this site.



Also, &nbsp;you have this free of charge online textbook in ALGEBRA-I in this site

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson>ALGEBRA-I - YOUR ONLINE TEXTBOOK</A>.


The referred lessons are the part of this textbook under the topic &nbsp;"<U>Quadratic equations</U>". 



Save the link to this online textbook together with its description


Free of charge online textbook in ALGEBRA-I
https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson


to your archive and use it when it is needed.


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<pre>
{{{v[1,2]}}} = {{{(-12 +- sqrt(12^2 + 4*1*220))/2}}} = {{{(-12 +- sqrt(144+880))/2}}} = {{{(-12 +- sqrt(1024))/2}}} = {{{(-12 +- 32)/2}}}.


There are two roots:  {{{v[1]}}} = {{{(-12+32)/2}}} = {{{20/2}}} = 10,  and

                      {{{v[2]}}} = {{{(-12-32)/2}}} = {{{-44/2}}} = -22.
</pre>