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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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