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Evaluating Expressions

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Evaluating Expressions

Expressions

An expression is NOT an equation

because it DOES NOT have an equal

sign. There are 2 types of expressions.

- 5 + 84 Numerical
- 3x + 10 Algebraic

Notice there are no equal signs in these

Expression (so they are not equations!)

Evaluate means to find the value of an algebraic expression by substituting numbers in for variables. (Plug & Chug)

m = 2

8 + m ?

8 + 2

10

1) ab - c

3)

(3)(4) - 5

2(3) + 4 2

6 + 4 2

12 - 5

6 + 2 = 8

7

2) 2a(b - c)

4)

2(3)(4 - 5)

2(4 + 5)

2(3)(-1)

3

18

2(9)

-6

=

= 6

3

3

Substitution is when you substitute

numbers in for variables. (It’s the same as evaluating).

Example:x = 4

x + 12 + x = ?

Substitute the 4 in for x4 + 12 + 4

= 20

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