Think about the operation to be used.
What is referred for 3
x multiplied by itself and product of x and y gives two individual terms of an expression
For finding the perimeter, we need to add all three sides.
Add the like coefficients separately.
Put the value of x.
perimeter is the sum of all sides
Like terms can be added or subtracted whereas unlike terms cannot.
For polygon with n vertices, number of diagonals
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