Sum and Product of Roots Formula - YourTeacher.com

For a complete lesson on the sum and product of roots formula, go to http://www.yourteacher.com - 1000+ online math lessons featuring a personal math teacher inside every lesson! In this lesson, students learn the sum and product of roots formula, which states that if the roots of a quadratic equation are given, the quadratic equation can be written as 0 = x^2 -- (sum of roots)x + (product of roots). For example, to write a quadratic equation that has the given roots --9 and 4, the first step is to find the sum and product of the roots. Since the sum of the roots is --5, and the product of the roots is --36, the quadratic equation can be written as 0 = x^2 -- (-5)x + (-36), which simplifies to 0 = x^2 + 5x -- 36.

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[killerkitty777]

i'm lost i hate math

[Jerrixlykme]

ahh thanx, her voice is so annoying to listen to

[bloodypinksock]

what an old bag.

[8isthemagicnumber]

Look it's a terminator from the future!

[ozoroDo14]

Your voice is annoying

[mazza2011100]

@thebombdiggityism A negative and a positive together is a negative.. so like.. -5 + 6 = -11

[thebombdiggityism]

How did she get -6 out of the negative square root of 6 and the positive square root of 6 ???

[harajukugirlxx3]

i fucking hate math. i'll take the zero tomorrow

[raiyan55]

wish my math teacher could write that neatly. he writes like a pig

[alexjun98]

lol look at the end of the video he just stare at the cam like a boss.

[orthodoxmaster]

@gweenyful  this is cubic

[orthodoxmaster]

@gweenyful this isn't a quadratic equation