IXL | Evaluate multi-variable expressions with exponents

Find the value of the expression

(c − 2^d) × 3 × 4

for c = 9 and d = 3.

ref_doc_title.

Learn with an example

question

Find the value of the expression

t^u

for t = 2 and u = 2.

key idea

Order of operations:

1. Parentheses
2. Exponents
3. Multiplication and Division
4. Addition and Subtraction

You can use the sentence "Please Excuse My Dear Aunt Sally" to help you remember.

solution

Plug in t = 2 and u = 2.

t^u

2²

Now evaluate. Follow the order of operations.

Step 1: Do operations inside parentheses.

There are no parentheses. Go on to step 2.

Step 2: Evaluate exponents.

2²

4

Step 3: Multiply and divide from left to right.

There are no multiplication or division signs. Go on to step 4.

Step 4: Add and subtract from left to right.

There are no addition or subtraction signs.

You are finished evaluating the expression.
So, for t = 2 and u = 2:

t^u = 4

Looking for more? Try this:

$Confetti$

Excellent!

Now entering the Challenge Zone—are you ready?

Questions
answeredQuestions

Time
elapsedTime

hr	min	sec
00	00	02

SmartScore
out of 100
IXL's SmartScore is a dynamic measure of progress towards mastery, rather than a percentage grade. It tracks your skill level as you tackle progressively more difficult questions. Consistently answer questions correctly to reach excellence (90), or conquer the Challenge Zone to achieve mastery (100)! Learn more

Teacher tools

Work it out

Not feeling ready yet? These can help:

Y.4Evaluate variable expressions with whole numbers

D.2Evaluate powers with whole number bases

Excellent! You got that right!

Jumping to level 1 of 1

Excellent!