Rectangle Perimeter Problem: Solve for X When Sides are (x-10) and (4x-8)

The perimeter of the rectangle below is 24.

Calculate x.

AAABBBCCCDDD4x-8x-10

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find X
00:04 The perimeter of the rectangle equals the sum of its sides
00:08 Opposite sides are equal in a rectangle, therefore each side appears twice
00:11 We'll substitute the perimeter value according to the given data, and solve for X
00:14 Group terms
00:17 Isolate X
00:19 And this is the solution to the problem

Step-by-step written solution

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1

Understand the problem

The perimeter of the rectangle below is 24.

Calculate x.

AAABBBCCCDDD4x-8x-10

2

Step-by-step solution

To solve this problem, we'll use the perimeter of a rectangle formula:

  • Step 1: Identify the side lengths.
  • Step 2: Use the perimeter formula to set up the equation.
  • Step 3: Solve for x x .

Now, let's work through each step:

Step 1: The side lengths are x10 x - 10 and 4x8 4x - 8 .
Step 2: The perimeter P P is given by 2(x10)+2(4x8)=24 2(x - 10) + 2(4x - 8) = 24 .

Simplify the equation:

2(x10)+2(4x8)=24 2(x - 10) + 2(4x - 8) = 24 2x20+8x16=24 2x - 20 + 8x - 16 = 24

Combine like terms:

10x36=24 10x - 36 = 24

Step 3: Solve for x x :

10x=24+36 10x = 24 + 36 10x=60 10x = 60 x=6 x = 6

Therefore, the value of x x is 6 \boxed{6} .

3

Final Answer

6

Practice Quiz

Test your knowledge with interactive questions

Look at the rectangle ABCD below.

Side AB is 6 cm long and side BC is 4 cm long.

What is the area of the rectangle?
666444AAABBBCCCDDD

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