92.131
Lecture 1
1 of 13
Ronald Brent © 2010 All rights reserved.
Factoring
Recall that factoring an expression means writing it as a product.
1)
Common factors
2)
Special formulas
3)
Grouping
Common Factors
The easiest tool to use is to take out all factors that are common to all the
terms of the expression.
Factor
2
3
3
4
3
20
16
4
y
x
y
x
y
x
+
−
.
Notice that all three terms share a factor of 4, as well as
x
and
2
y
.
So, taking out this common factor of
2
4
y
x
, we get
)
5
4
(
4
20
16
4
2
2
2
2
2
3
3
4
3
x
y
y
x
y
x
y
x
y
x
y
x
+
−
=
+
−
.

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