The sides of a rectangle have lengths x+9 and widths x-3. Write an equation that describes the perimeter, P, of the rectangle in terms of x.

Question

I do not understand this problem, could someone please help me?

Answer 1

Perimeter = 2(width) + 2(length)
= 2(x-3) + 2(x+9)
= .....

expand, collect like terms and simplify