00:01
Problem for being asked to simplify the given expression.
00:03
Remember, when you simplify expressions, first thing you need to do is remove parentheses by using distributed property.
00:09
Well, in front of the first preemphasy, there's a negative sign.
00:12
So a negative sign in front of parentheses will change the sign of both terms inside that preemphasy.
00:18
So in other words, the negative 7p will become positive 7p, and the positive 9 will become negative 9.
00:25
Now, in front of the second preemphasy, there's a plus sign.
00:28
However, when you distribute a positive sign, it will not change any of those terms.
00:32
So we'll still have a positive 3p and a minus 1...