1. Evaluating Algebraic Expressions

2. 6 + 2x Variable: Constant: Expression:
Is a quantity that can change or vary. Mathematicians use letters to represent variables.
Constant:
A quantity that does not change.
Expression:
Is a mathematical phrase involving constants, variables, and operation symbols.

3. Evaluate each expression for x=1, 2, and 3.
1 + 5 = 6 2
2 + 5 = 7 3
3 + 5 = 8

4. Evaluate each expression for x=3, 4, and 5.
11 – 3 = 8 4
11 – 4 =7 5
11 – 5 = 6

5. x 4x + 8 6 7 8 Evaluate each expression for x=6, 7, and 8.
4(6) **Use order of operations to solve
= 32 7
4(7) **Use order of operations to solve
= 36 8
4(8) **Use order of operations to solve
= 40

6. x 12/x + 2x 2 4 6 Evaluate each expression for x=2, 4, and 6.
12/2 + 2(2) **Use order of operations to solve
6 + 4 10 4
12/4 + 2(4) **Use order of operations to solve
3 + 8 12 6
12/6 + 2(6) **Use order of operations to solve
2 + 12 14

7. x x² + 1 2x 18/x 1 12 + 1= 2(1)= 18/1= 2 22 + 1= 2(2)= 18/2= 3 32 + 1=
Evaluate each expression for x=1, 2, and 3. x
x² + 1 2x
18/x 1
12 + 1=
2(1)=
18/1= 2
22 + 1=
2(2)=
18/2= 3
32 + 1=
2(3)=
18/3=

8. x x² + 1 2x 18/x 1 12 + 1= 1x1+1=2 2(1)=2 18/1=18 2 22 + 1= 2x2+1=5
ANSWERS x
x² + 1 2x
18/x 1
12 + 1=
1x1+1=2
2(1)=2
18/1=18 2
22 + 1=
2x2+1=5
2(2)=4
18/2=9 3
32 + 1=
3x3+1=10
2(3)=6
18/3=6

9. Evaluate each expression x= 3, 4, 5.
7x x
3. 60/x x + 23

10. Evaluate each expression for n = 5.
(3n + 5n)10
12 x n/2