00:01
Okay, i want to find the equation of this parabola going through the three points they give you.
00:05
So negative 4, negative 1 and negative 8.
00:09
It's a two -step process.
00:11
First of all, figure out the equation that will give the roots of negative 4 and negative 1, or the 0s, negative 4, negative 1.
00:21
That will be x plus 4 times x plus 1 equals 0.
00:31
That gives the correct roots, which is x equals negative 4 and negative 1.
00:37
It's not quite the answer yet because i can see from the graph here, it's n -shaped, which means the x -square term must be negative.
00:50
I have been so far, x plus 4, x plus 1 equals 0.
00:58
If i put minus here and minus over here and minus 1 here, no change, same roots...