Understanding Perfect Squares and Square Roots

This video tutorial covers solving word problems involving perfect squares and square roots. It explains how to calculate the side length of a square from its area and how to determine the perimeter for fencing. The video also demonstrates solving equations with radicals, specifically x² equations, by taking square roots. Examples include finding side lengths for areas of 25 and 144 square units and solving x² equations for values like 16, 100, and 49.

What is the main focus of this video tutorial?

• Applications of perfect squares and square roots

• Applications of linear equations

• Applications of trigonometry

• Applications of calculus

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CCSS.8.EE.A.2

If the area of a square is 25 square centimeters, what is the length of one side?

• 6 cm

• 3 cm

• 4 cm

• 5 cm

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CCSS.8.EE.A.2

Sally wants to fence her square yard with an area of 81 square feet. How much fencing does she need?

• 24 feet

• 36 feet

• 40 feet

• 45 feet

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CCSS.8.EE.A.2

What is the square root of 16?

• 2

• 8

• 4

• 6

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CCSS.8.EE.A.2

Which of the following numbers is a solution to the equation x² = 100?

• 5

• 15

• 20

• 10

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CCSS.8.EE.A.2

What is the square root of 49?

• 8

• 7

• 6

• 5

Tags

CCSS.8.EE.A.2

In solving x² = 16, why do we consider both positive and negative roots?

• Because squaring a number results in a negative value

• Because both roots are always positive

• Because both roots are always negative

• Because squaring a number results in a positive value

Tags

CCSS.8.EE.A.2

If the area of a square is 144 square feet, what is the length of one side?

• 12 feet

• 11 feet

• 13 feet

• 10 feet

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CCSS.4.MD.A.3

CCSS.3.MD.C.7B

What is the formula for the area of a square?

• Area = side ÷ side

• Area = side - side

• Area = side × side

• Area = side + side

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CCSS.8.EE.A.2

When finding the side length of a square from its area, why do we only use the principal root?

• Because the side length is always positive

• Because the side length cannot be negative

• Because the side length can be negative

• Because the side length is always zero

Tags

CCSS.8.EE.A.2