Well they both have integers in it there the same thing except your adding and subtracting. <span>Subtraction is the same thing as adding the opposite of the number. </span>
You need to use division.
Answer:
-- Proved

Step-by-step explanation:
Given


Required
Show that 
The volume is calculated as:

Open the brackets



Collect Like Terms


Divide through by 4


Solving further:
Expand the expression

Factorize:


Split:


Answer:
-7
Step-by-step explanation: