Evaluating Algebraic Expressions

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.

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

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

x 4x + 8 6 7 8 Evaluate each expression for x=6, 7, and 8. 4(6) + 8 **Use order of operations to solve 24 + 8 = 32 7 4(7) + 8 **Use order of operations to solve 28 + 8 = 36 8 4(8) + 8 **Use order of operations to solve 32 + 8 = 40

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

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=

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

Evaluate each expression x= 3, 4, 5. 7x 2. 15-x 3. 60/x 4. x + 23

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