Variables and Expressions

The branch of mathematics that involves expressions with variables is called algebra. n + 2 This is an algebraic expression because it contains variables, numbers and at least one operation

Example: Evaluate n + 3 if n = 4. n+ 34= 7 Evaluate c – 5 if c = 11. c– 5 11 = 6 R O C K S T A R

More examples: Evaluate each expression if c = 8 and d = 5. c + d 8 + 5= – c + d 15 – = 12

In algebra, sometimes the multiplication sign is omitted. 6d6d6d6d 9st mn six times d nine times s times t m times n

Don’t forget PEMDAS!! Let’s work it out! Evaluate 8w – 2y if w = 5 and y = 3. 8w – 2y 8(5) – 2(3) 40 – 6 34

Evaluate 4c if c = 3. 4c (3) (9) **PEMDAS**

Last one! Evaluate (5 + g) 2 if g = 3. Evaluate (5 + g) 2 if g = 3. 2 (5 + g) 2 2 (5 + 3) 2 2 (8) == 32

Your assignment… Page 46 #14 – 32 evens Page 46 #14 – 32 evens 10 problems! DO YOUR BEST!