Find Side Length x+4 in a Square with Area 36

In front of you is a square.

The expressions listed next to the sides describe their length.

( x>4 x>-4 length measurements in cm).

Since the area of the square is 36.

Find the lengths of the sides of the square.

363636x+4x+4x+4

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find the lengths of the sides of the square
00:03 We'll use the formula for calculating the area of a square (side squared)
00:09 We'll substitute appropriate values according to the given data and solve for X
00:14 We'll take the square root to eliminate the square
00:17 When taking a square root, remember we get 2 solutions
00:20 One positive and one negative
00:23 Let's isolate the unknown and find the solution for each possibility
00:29 This is one solution
00:33 This solution doesn't fit the given domain
00:37 Let's find the second solution using the same method
00:41 This is the solution for X
00:43 Now let's substitute this solution in the expression for the side, and solve to find the side
00:51 And this is the solution to the problem

Step-by-step written solution

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1

Understand the problem

In front of you is a square.

The expressions listed next to the sides describe their length.

( x>4 x>-4 length measurements in cm).

Since the area of the square is 36.

Find the lengths of the sides of the square.

363636x+4x+4x+4

2

Step-by-step solution

To solve for the side length of the square, we follow these steps:

  • Step 1: Given each side of the square as x+4 x+4 cm, use the area formula for a square: Area=(side length)2 \text{Area} = (\text{side length})^2 .
  • Step 2: Since the area is 36 cm2^2, set up the equation:
  • (x+4)2=36(x+4)^2 = 36.

  • Step 3: Solve for x+4 x+4 :
  • Taking the square root of both sides,

    x+4=6x+4 = 6 or x+4=6x+4 = -6.

  • Step 4: Solve each equation for x x :
    • From x+4=6x+4 = 6, we get x=2x = 2.
    • From x+4=6x+4 = -6, we get x=10x = -10.
  • Step 5: Apply the condition x>4 x > -4 :
  • Only x=2x = 2 satisfies the condition x>4x > -4.

  • Step 6: Calculate the side length using x=2 x = 2 :
  • Side length = x+4=2+4=6 x+4 = 2+4 = 6 cm.

Therefore, the length of the sides of the square is 6 6 cm.

3

Final Answer

6

Practice Quiz

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Find the value of the parameter x.

\( (x-5)^2=0 \)

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