WU: Day 056 Square and Cube Roots

What is a square?

How to Square A Number: 

To square a number: multiply it by itself.

Example: What is 3 squared?

3 Squared= 3 × 3 = 9

 "Squared" is often written as a little 2 in the upper right corner of the number (the little 2 says the number appears twice in multiplying)

Multiple Choice

Can we take the square root of a negative number?

• yes

• no

Multiple Choice

How many answers do can you get when you find the square root of a number?

• 1

• 2

• 3

• 4

• None of the Above

Multiple Choice

Does the square root of $$\sqrt{121}$$ have one or two solutions? 

• 1

• 2

Multiple Choice

To solve for x when $$x^2=121$$ we take the square root of both sides of the equation $$\sqrt[]{x^2}=\sqrt[]{121}$$

the square root of x squared is x so we write $$x=\pm\sqrt[]{121}$$

the $$\pm$$ tells us that x will have two solutions {11, -11}

how many values of x will solve $$\sqrt[]{x^2}=\sqrt[]{121}$$

• 1

• 2

Math Response

What is the square root? $$\sqrt{81}$$  

Type answer here

Correct Answer: 9

Deg^°

Rad

Steps to approximate cube roots

• Locate the closest perfect cube root (one smaller, one bigger)

• Decide which one is actually closer to the desired radicand

• Approximate its value if it was on a number line.