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## Class 8 Math (Assamese)

### Course: Class 8 Math (Assamese)>Unit 6

Lesson 1: Cube roots using factorisation

# Intro to cube roots

Learn the meaning of cube roots and how to find them. Also learn how to find the cube root of a negative number.

## Want to join the conversation?

• Is there any easy method for finding a square root .... especially for bigger numbers like 1225 or etc..
• Is there any easy way to memorize cube roots? Is there a pattern or some way to help mentally solve cube roots without using a calculator or doing any work?

Thanks
• If the last digit of a cube root is 2 then the unit digit will be 8. If the last digit of a cube root is 3 then the unit digit will be 7. If the last digit of a cube root is 7 then the unit digit will be 3. If the last digit of a cube root is other than 2, 3, 7 and 8 then put the same number as the unit digit.
• What are imaginary numbers? i forget
• An imaginary number is a complex number that can be written as a real number multiplied by the imaginary unit i, which is defined by its property i² = −1. The square of an imaginary number bi is −b². For example, 5i is an imaginary number, and its square is −25. Zero is considered to be both real and imaginary.
• can a cube root be a negative?
• Yes this is possible. The cube root of a negative number is negative. For example, the cube root of -8 is -2, because (-2)^3 = (-2)(-2)(-2) = -8.

Have a blessed, wonderful day!
• I'm still really confused about cube roots and all. I went through some of the explanations but they used all of these fancy words or numbers and I wish there was an explanation for this which explained it as simply as possible.
• When you cube a number, you raise it to an exponent of 3.
For example: 2^3 = 2*2*2 = 8

A cube root reverses this process. You are being asked to find the number that was originally "cubed".
For example: cube root(8) = 2 because 2^3 = 8

Hope this helps.
• whoever see this. have a good day
• If you are reading this I hope you have a wonderful day and life treats you well, no matter what the situation remember to stay positive and push through cause your a strong person and you'll have good luck soon:)
• Thank you so much! I really needed this today! You're right, life is full of challenges and belly jelly😅 🤬 Please post more encouragement sometimes because it really helps my inner being.
• Why are people bragging in the comments about how young they are?? It's not cool to do higher level math, it just puts you under a lot of stress :/
• First off, you do not know if they are telling the truth or not. Secondly, math is individual, so it is possible they understand higher grades than they are in. I do agree that they should not have to brag about it.
• So, you multiply kind of like finding a shapes volume?