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Math Help - simplified expression for shapes

  1. #1
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    simplified expression for shapes

    I have a rectangle with the lenght of 5c+2 and width of 9c-10. I was wondering how do i get the simplified expression for the perimeter?
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  2. #2
    A riddle wrapped in an enigma
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    Quote Originally Posted by Jubbly View Post
    I have a rectangle with the lenght of 5c+2 and width of 9c-10. I was wondering how do i get the simplified expression for the perimeter?
    Hi Jubbly,

    Do you know that P = 2L + 2W?

    Just substitute and combine like terms:

    P=2(5c+2)+2(9c-10)

    P=10c+4+18c-20

    P=28c-16

    That's as simplified as it gets.
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  3. #3
    Member rtblue's Avatar
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    Thumbs up

    Actually, this can be simplified more.

    P=28c-16

    P=4(7c-4)
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  4. #4
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    Quote Originally Posted by rtblue View Post
    Actually, this can be simplified more.

    P=28c-16

    P=4(7c-4)
    An algebraic expression is in simplest form when it contains no parentheses or like terms.
    www.mathchamber.com/algebra/docs/general/glossary.htm
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  5. #5
    Member rtblue's Avatar
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    well... all i know is that when i take a test, and the answer can be factored, such as the answer above, my teacher requires me to factor. She says that it is in the simplest form when factored.
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