A rectangle has side lengths x + 2 and x – 1. What is the perimeter of the rectangle when x = 5?

Question

A rectangle has side lengths x + 2 and x – 1. What is the perimeter of the rectangle
when x = 5?

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Kim Cúc 1 year 2021-08-01T22:33:28+00:00 1 Answers 38 views 0

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    2021-08-01T22:35:16+00:00

    Answer:

    22 units

    Step-by-step explanation:

    The perimeter is all the sides of any polygon added up.

    A rectangle has 4 sides, but we only need two sides to solve this because a rectangle has symmetry

    There are two ways

    Method 1:

    x+2 + x-1 + x+2 + x-1   OR   2(x+2) + 2(x-1)

    simplify: 2x + 4 + 2x – 2

                  4x +2

    Plug 5 into x: 4(5) + 2

    Answer: 22

    Method 2:

    plug in x to get the sides: 7 and 4

    now add: 7 + 7 + 4 + 4   OR   2(7) + 2(4)

    simplify: 14 + 8

    Answer: 22

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )