Math Problem Statement

Find the measurements of each side, if the perimeter is 32 cm. The expressions for the sides are 2x + 3 and x - 5. Solve for x.

Solution

The image contains a mathematical problem where you're tasked with finding the dimensions of a rectangle given the perimeter. The side lengths of the rectangle are represented by the expressions 2x+32x + 3 and x5x - 5. The perimeter of the rectangle is given as 32 cm.

Step-by-step Solution:

  1. Perimeter Formula for a Rectangle: The formula for the perimeter of a rectangle is: P=2×(length+width)P = 2 \times (\text{length} + \text{width}) In this case, the length is 2x+32x + 3 and the width is x5x - 5.

  2. Substitute the given values: Since the perimeter is 32 cm, we can set up the equation: 32=2×((2x+3)+(x5))32 = 2 \times \left( (2x + 3) + (x - 5) \right)

  3. Simplify the equation: First, combine the terms inside the parentheses: 32=2×(3x2)32 = 2 \times (3x - 2) Now, distribute the 2: 32=6x432 = 6x - 4

  4. Solve for xx: Add 4 to both sides: 36=6x36 = 6x Now divide by 6: x=6x = 6

Final Step: Substitute the value of xx into the expressions for the length and width.

  • Length: 2x+3=2(6)+3=12+3=152x + 3 = 2(6) + 3 = 12 + 3 = 15 cm
  • Width: x5=65=1x - 5 = 6 - 5 = 1 cm

Thus, the dimensions of the rectangle are:

  • Length = 15 cm
  • Width = 1 cm

Would you like a more detailed explanation or have any other questions? Here are 5 related questions to explore:

  1. How would the perimeter change if the expressions for the sides were different?
  2. What would the area of the rectangle be with these dimensions?
  3. How can you find the perimeter of a square with side length x+5x + 5?
  4. What happens if the perimeter was 40 cm instead of 32 cm?
  5. How would you solve a similar problem if given the area instead of the perimeter?

Tip: When dealing with algebraic expressions in geometric problems, always simplify the expressions before substituting values. This reduces mistakes and makes the equation easier to solve!

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Math Problem Analysis

Mathematical Concepts

Algebra
Perimeter of a Rectangle
Linear Equations

Formulas

Perimeter of a rectangle: P = 2 * (length + width)

Theorems

Solving linear equations

Suitable Grade Level

Grades 7-9