The quadratic equation is minus b.

You could do the quadratic equation.

So let's use the quadratic equation.

That's that part of the quadratic equation.

You would use a quadratic equation here.

What's the denominator of a quadratic equation?

We don't need the quadratic equation here.

When in doubt, use the quadratic equation.

And let's put this in a quadratic equation, or try to solve this, so we can apply the quadratic equation.

I guess a quadratic equation is actually what you're trying to solve, and what a lot of people call the quadratic equation is actually the quadratic formula.

So this radical equation his simplified to just a standard quadratic equation.

Complete the square on the general quadratic equation.

And then we can use the quadratic equation.

And you've pretty much derived the quadratic equation.

There's no real solution to the quadratic equation.

So let's say I have a quadratic equation.

So let's just apply the quadratic equation here.

That's actually where the quadratic equation comes from.

And this formula, right here, for solving any quadratic equation is called the quadratic formula.

The quadratic equation says that the roots of a quadratic are equal to and let's say that the quadratic equation is a x squared plus b x plus c equals 0.

So let's apply the quadratic equation to this equation that we just wrote down.

Sal Khan So this is a quadratic equation, essentially.

And this once against is just the quadratic equation.

Welcome to the presentation on using the quadratic equation.

But in general well, let's try the quadratic equation.

That's the best way to solve a quadratic equation.

So there is no solution to this quadratic equation.

Well, it's a way to solve a quadratic equation.

The other option is to do the quadratic equation.

But the quadratic equation is essentially completing the square.

I don't have to take out the quadratic equation.

So this is a straight up quadratic equation, so we could use the quadratic formula here.

And maybe I'll show you in a future video, the quadratic equation and I think I've already done one where I proved the quadratic equation.

So you could use the quadratic equation to solve this.

So the quadratic equation, it sounds like something very complicated.

And they just want us to apply the quadratic equation.

You might have to use a quadratic equation or something.

The quadratic equation is actually proven using completing the square.

Now we just substitute these values into the actual quadratic equation.

And here we can use a tool called a quadratic equation.

And then either factor it or use the actual quadratic equation.

So we just have a plain vanilla quadratic equation right here.

But the quadratic equation is negative B So b is 5, right?

Maybe if you use a quadratic equation there are no real solutions.

You might recognize that this is a quadratic equation right over here