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### Course: 6th grade (Illustrative Mathematics)>Unit 6

Lesson 15: Lesson 15: Equivalent exponential expressions

# Evaluating expressions like 5x² & ⅓(6)ˣ

Evaluating expressions with exponents involves substituting a given value for the variable and following the order of operations. Calculate the exponent first, then perform any multiplication or division. Mastering this skill is essential for solving more complex algebraic problems and understanding mathematical relationships. Created by Sal Khan.

## Want to join the conversation?

• How does 1/3 x 36 = 12?
• 1 * 36 = 36
3 * 1 = 3
Since 36 = 36/1, 1*36 / 3*1 is the same thing as saying 36/3, or 12.

Or, think of it this way: 1/3 * 36 is the same as 36 / 3, which is also 12.
• I didn't pay attention
• neither did i, please be my friend
• How it equals 12 is because they did 36 divided by 3 = 12
• 36/3 = 12 can be simplified to (30/3 + 6/3)
which gives you 10 + 2, which is equal to 12.
• WHAT IS 6^2 + x - x^26
2
+x−x
2
6, squared, plus, x, minus, x, squared for x=3x=3x, equals, 3.
• It appears you tried to copy and paste a question, but the syntax is so confusing, it is difficult to tell what you are really asking.
• Just like ljperry, I did not pay attention whatsoever
• what is 10% of 100?
• `10%` of `100` is `10`.
Remember, the percentage denotes division by `100`. Of -> multiplication
So it is `10/100 * 100 => 10`.
• I need help I am confused with fractions and exponents.
What do with other fractions.
• what if it's 1/2x when x is 4
• It's worth noting that `1/2x` is arbitrary notation, because the `x` could either be the denominator or a value in front of the fraction to multiply.
Can you make it more clear next time?
Let's treat it as `1/2*x` since we do multiplications and divisions left-to-right.
When `x = 4`, `1/2*x => 1/2*4 = 2`.
• At the second question with thirds how do you do like thirds,half's and quarters. Do you divide your number by like thirds if it was thirds? For example 1/2 5 do you divide by half’s? I don’t think sal said anything about that.
• He was multiplying `1/3` by `12`.
The `1/3` fraction: Fractions mean division.
`1/3*12 = 12/3 = 4`.