12.1 and 12.2 Review (10/12)

12.1 and 12.2 Review

12.1 Simplifying Expressions

•  $-3T\ -2T\ -5-4$  

• Which are like terms?

•  $-3T\ and\ -2T\ \left(have\ same\ letter\right)$  

•  $-5\ and\ -4\ \left(both\ have\ no\ letter\right)$  

• Combine ( $-3T\ +\ -2T\ =\ -5T$  

•  $-5\ +\ -4\ =\ -9$  

• answer:  $-5T\ \ \ +\ -9$  

Multiple Choice

Simplify:

4T + 2T + 3 + 4 =

• 2T+ 7

• 6T + 7

• 6T + 1

12.2 Evaluating Expressions with Integers

•  $-8X\ +25\ \ \ \ \ when\ X=5$  

• Substitute 5 for X 

•  $-8\ \left(5\right)\ +\ 25\ =$  

• PEMDAS - multiplication first

•  $-40\ +\ 25$  

• One negative, one positive so you

• Subtract! 40 minus 25 = 15....answer is negative because bigger number is negative.  $-15$  

Multiple Choice

 $-3X\ =\ 20\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ When\ X\ =\ 3$  

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