00:01
We're being asked to simplify this expression.
00:02
Well, to do that, we first must get rid of our parentheses.
00:05
So let's start at the beginning.
00:06
We're going to have to first distribute the 40 to both terms in that first preemphasy.
00:11
Well, as you can see, both terms in the parentheses are fraction.
00:14
So i'm going to make 40 a fraction by putting it over 1.
00:17
Because remember, to multiply fractions, we multiply straight across.
00:20
So first, we must multiply 40 over 1 by 3 .8s y.
00:25
Well, 40 times 3 is 120, and 1 times 8 is 8.
00:30
And then we simply bring down our y term.
00:32
Next, we need to multiply 40 over 1 by negative 1 4.
00:36
Well, 40 times negative 1 is negative 40, and 1 times 4 is 4.
00:43
Now, if you see at the end of our problem, we see that 40 is getting multiplied by 4 5ths.
00:49
So let's go ahead and multiply this...