00:01
Given the function f, we want to find first f of a.
00:08
To find f of a, you just plug a in for x, wherever there is x in the function.
00:13
So it looks like 3 minus 5a plus 4a squared.
00:17
To find f of a plus h, you plug a plus h in for x wherever there is x in the function.
00:23
So 3 minus 5 times a plus h plus 4 times a plus h squared.
00:31
Now we need to do some simplifying.
00:35
We can distribute the negative 5 to get 3 minus 5a minus 5h.
00:40
Don't distribute the 4 yet.
00:42
You need to multiply.
00:43
Exponents before multiply.
00:45
Remember that.
00:46
Pemdas order of operations.
00:49
So four times a plus h squared is a plus h times a plus h...