00:01
All right, here we have the quadratic equation, x squared minus 5 equals 0.
00:07
And we're not actually going to solve this equation, but we're going to use what's called the discriminant, which is b squared minus 4a .c.
00:21
And you might recognize the discriminant is the part that's under the square root in our quadratic formula.
00:27
So i'm going to go over here to our quadratic equation, and i'm actually going to put in a middle term there.
00:35
There's no x term, but we can imagine that as zero x.
00:41
So i have x squared plus zero x minus five equals zero.
00:47
And that makes it a little bit easier for us to identify the values of a, b, and c to substitute into the discriminant.
00:58
So a we remember is the coefficient in front of our x squared term.
01:03
So a is 1.
01:06
B, and now you'll see why i wrote that in there...