The Quadratic Formula: How to Use the Discriminant to Determine Roots

Mahalo math expert Allison Moffett shows you how to use the discriminant to determine roots.

Solving for Roots Using the Discriminant
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The discriminant is part of the quadratic formula. It is the part that appears under the square root symbol and tells you what kind of roots are part of the quadratic equation.When you plug in the values a, b and c into the quadratic formula, there are three possibilities. Refer to the example below to see how to use the discriminant to determine roots.

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[kixwzzr]

Great video but you should've included what would happen if you got an answer of 0=0 or if you got an answer that was less than 0

[jezrelnyc]

ohmygodddd I learned so much under 2 minutes than one week in class! THANKS!!

[xXCHICAGOXx]

Oh my god thank you much i was over thinking it the whole time!

[hareeedy]

special thanks :)) .. and finally !! I learned it !!

[TheShinningstar]

Do you do anything else after you get lik for example 4+39=430?

[NjlampGaming]

its 2 am and i wish death apon myself however good video

[Itsaramis]

How is 4 B? This is the problem with math. They never explain "how" which is why so many people struggle with it.

[yasmin]

Did she just wrote all that numbers flipped horizontally? Whoaa

[VedantaDhobley]

yeah, i thought she just wrote it backwards, then i realized that it requires skill to do that repeatedly without making a mistake

[jimbojones]

Im given a discriminant and asked if the roots are (1) rational an unequal (2) rational and equal (3) irrational and unequal (4) not real all the info i get

[Alex-ilhm]

I wonder how many people here are now in prison.