00:01
Okay, for this question, we have a function like f of x equal to x squared plus 2x minus 4.
00:13
It would be very interesting to know f of negative x minus f of x.
00:21
In order to find this, we're going to have to make a substitution.
00:25
Everywhere that we have x in our original function, we'll now have a negative x for starters.
00:31
So instead of x squared, we'll have negative x to the second power plus two times negative x minus four.
00:41
That would be this here.
00:44
Now we're going to subtract the original function, and i'll put it in parentheses, x squared plus 2x minus four.
00:53
The negative sign here reverses the sign of everything inside the parentheses.
00:58
Negative x to the second power is going to be x squared...