Answer: 28
Step-by-step explanation: The vertical bars on either side of the number represents absolute value, which represent "distance from zero."
The key thing to remember is that absolute value of any positive or negative number is positive.
In this problem, we first determine each absolute value.
The absolute value of 7 is 7 and the absolute value of -4 is 4.
So we can write this as (7) · (4).
Noticed that I used parentheses when I first got rid of the absolute value. This is a great habit to get into to avoid confusion.
So we have (7) · (4) which is 28.