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Theory
Factor a difference of squares
An expression on the form
a
2
−
b
2
can be factored to a
product of two binomials
.
a
2
−
b
2
=
(
a
+
b
)
(
a
−
b
)
An example is the expression
x
2
−
2
5
which can be written as
x
2
−
5
2
,
and thus, be factored to a product of conjugate pair of
binomials
.
x
2
−
5
2
=
(
x
+
5
)
(
x
−
5
)
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