Calculate Square Perimeter from Area Expression: (3²-1²)+2³

Square Properties with Exponential Expressions

Given a square whose area is

(3212)+23 (3^2-1^2)+2^3

What is the perimeter of this square?

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Determine the perimeter of the square
00:07 Calculate the area of the square
00:14 Calculate the powers
00:26 Solve the parentheses
00:31 This is the area of the square
00:37 Use the formula for calculating square area (side squared)
00:42 Extract the root to isolate side A
00:47 This is the length of the square's side
00:54 The perimeter of the square equals 4 times the side (because all sides are equal)
01:02 This is the solution

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Given a square whose area is

(3212)+23 (3^2-1^2)+2^3

What is the perimeter of this square?

2

Step-by-step solution

To solve this problem, we need to find the perimeter of a square given its area. The area of the square is given by the expression (3212)+23 (3^2-1^2)+2^3 .

Let us evaluate the expression to find the area:

  • Calculate 32 3^2 , which is 9 9 .
  • Calculate 12 1^2 , which is 1 1 .
  • Subtract to find 3212=91=8 3^2 - 1^2 = 9 - 1 = 8 .
  • Calculate 23 2^3 , which is 8 8 .
  • Add the results: 8+8=16 8 + 8 = 16 .

Therefore, the area of the square is 16 16 .

In general, the area of a square is given by the formula s2 s^2 , where s s is the side length of the square. To find the side length, we solve the equation:

  • s2=16 s^2 = 16 .
  • Taking the square root of both sides, we find s=16=4 s = \sqrt{16} = 4 .

The perimeter P P of a square with side length s s is given by the formula:

  • P=4s P = 4s .

Thus, substituting the value of s s :

  • P=4×4=16 P = 4 \times 4 = 16 .

Therefore, the perimeter of the square is 16 16 .

3

Final Answer

16 16

Key Points to Remember

Essential concepts to master this topic
  • Order: Evaluate exponents before addition and subtraction operations
  • Technique: Calculate 3212+23=91+8=16 3^2 - 1^2 + 2^3 = 9 - 1 + 8 = 16
  • Check: Side length 4 gives perimeter 4×4=16 4 \times 4 = 16

Common Mistakes

Avoid these frequent errors
  • Finding side length instead of perimeter
    Don't stop after calculating the side length = gives answer 4 instead of 16! The question asks for perimeter, not side length. Always multiply the side length by 4 to get the perimeter of a square.

Practice Quiz

Test your knowledge with interactive questions

\( 5+\sqrt{36}-1= \)

FAQ

Everything you need to know about this question

Why do I need to evaluate the expression first?

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The expression (3212)+23 (3^2-1^2)+2^3 gives you the area of the square, not the side length. You must simplify it to get the numerical area value before finding the side length.

How do I know when to find area vs perimeter?

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Area is the space inside (measured in square units), while perimeter is the distance around the outside. The question specifically asks for perimeter!

What if I can't remember the square root of 16?

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Think of perfect squares: 12=1 1^2 = 1 , 22=4 2^2 = 4 , 32=9 3^2 = 9 , 42=16 4^2 = 16 . So 16=4 \sqrt{16} = 4 .

Why is the perimeter formula 4s and not s + s + s + s?

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Both are correct! A square has 4 equal sides, so adding them gives s+s+s+s=4s s + s + s + s = 4s . The formula P=4s P = 4s is just the shortcut.

What order should I follow when evaluating the area expression?

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  • First: Calculate exponents 32=9 3^2 = 9 , 12=1 1^2 = 1 , 23=8 2^3 = 8
  • Then: Subtract and add from left to right: 91+8=16 9 - 1 + 8 = 16

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