What I learned in Grade 9 Exponents

So, what have I learned about Exponents up until this point? Well, why don’t we start off with the basics.

What is an exponent?

An exponent is a simple version of multiplying a number to itself, the exponent is located at the top right of a variable, like so:

x^2

The exponent shows us how many times it has to multiply itself, if a number like 2 is raised to the power of 2, then the equation will look likeĀ  (2 x 2), if it’s raised to the power of 4, then it’s (2 x 2 x 2 x 2).

There are special terms for certain exponents however, the power of 2 is called a square, the power of 3 is called a cube, the rest are simply “x raised to the power of y”

 

What is the difference between evaluating and simplifying?

If we had a question like “3^2\cdot 3^4“, then the end result can be “3^6” without any repercussions, that is evaluating.

But if we had a question like “4^4\cdot 4^5“, then we need to simplify it to it’s lowest form, the end result is then “1280” instead of “4^9“, that is simplifying.

 

What is Multiplication Law?

If we are multiplying two exponents that have the same base, we can just add the exponents together.

5^4\cdot 5^4 = 5^8

What is Division Law?

The opposite of multiplication law, if we are dividing two exponents that have the same base, we can just subtract the exponents.

6^9\div 6^8 = 6^1

What is Power of a Power law?

If we have an exponent that has another exponent outside of it, then we need to multiply the exponents together.

(7^3)^3 = (7^9)

What are Exponents on Variables?

The only difference between exponents on numbers and exponents on variables is that there isn’t a simplified answer for exponents, since the value is unknown, then you can simply just add the exponents like in Multiplication law.

x^2\cdot x^3 = x^5

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