At a Glance  Evaluating Algebraic Expressions
To evaluate an algebraic expression, just plug numbers into the expression and simplify it.
Don't Forget: you will need your faithful friend PEMDAS (aka Order of Operations).
Here's a video example of math in action. Practice, practice, practice.
Example 1
Evaluate the expression when x = 2, y = 3, and z = 1. 
Example 2
Find the values of the expression for x = 2, 1, 0, 1, 2 This question is asking us to evaluate the expression for five different values. It may be easiest to do this in chart form.

Example 3
Which of these values (2, 1, 0, 1, 2) makes this equation true? Just like the previous problem, it is probably useful to make a chart. 
Exercise 1
Evaluate the expression 3x^{2} + 5xy – 2 for x = 3 and y = 2.
Exercise 2
The formula for the surface area of a cone is πrs + πr^{2}, where r is the radius of the base and s is the length of the slant. Find the surface area of a cone with radius 10 cm and a slant of 12 cm (use 3.14 for π).
Exercise 3
Evaluate the expression x^{3} + x^{2} + x + 1 for x values equal to 2, 1, 0, 1, 2.
Exercise 4
Which of these values of x (1, 2, 3, 4, 5, 6) make this equation true: x^{2} – 8x = 12?