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Lesson 4: Substitution & evaluating 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
• 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.
• 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.
• 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
• 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.
• no you divide by 2 when you multiply by 1/2
• can you help me