To evaluate algebraic expressions you must know the value of the variable. The values of the variables will always be given. Here's an example:

Evaluate the expression 4b + 3c - 10 for b=5 and c=2.

To evaluate simply substitute the value of the variable and follow order of operations. In class, I expect to see the substitution. This is the expectation:

4

**(5)**+ 3

**(2)**- 10 This shows the substitution

20 + 6 - 10 This demonstrates following the orders of operations

26 - 10

16 Solution

Here's another

Evaluate x^y - xyz + 6(z - y) when x=2, y=3, and z=(-1)

2^3 - (2)(3)(-1) + 6(-1 - 3)

8 - (-6) + 6(-4)

8 + 6 + (-24)

14 + (-24)

(-10)