Algebra 2 Problem

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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.

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

  • Algebra 2 Problem -

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

    expand, collect like terms and simplify

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