Cool math Algebra Help Lessons: Polynomials - Substitution (Sticking Numbers In)

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Coolmath Algebra
Polynomials lesson 1 - Substitution (Sticking Numbers In) (page 1 of 1)
---- This algebra lesson explains how to do substitution with polynomials.

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In regular math books, this is called "substituting" or "evaluating"... But, those are pretty big words for something so easy.

Check it out:

We are given something like this:

And we need to find what this thing equals when we put a number in for x... Like

x = 3

Everywhere you see an x... stick in a 3!

What about x = -5?
We need to be careful with the negative! Use ( )!

TRY IT:

Let x = 2:

Let x = -1:

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