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\[{x}^{2}-16\]
+
−
.
ln
>
<
×
÷
/
log
≥
≤
(
)
log
x
=
%
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factor(x^2-16)
factor x^2-16
{x}^{2}-16
1
Rewrite it in the form
a
2
−
b
2
{a}^{2}-{b}^{2}
a
2
−
b
2
, where
a
=
x
a=x
a
=
x
and
b
=
4
b=4
b
=
4
.
x
2
−
4
2
{x}^{2}-{4}^{2}
x
2
−
4
2
2
Use
Difference of Squares
:
a
2
−
b
2
=
(
a
+
b
)
(
a
−
b
)
{a}^{2}-{b}^{2}=(a+b)(a-b)
a
2
−
b
2
=
(
a
+
b
)
(
a
−
b
)
.
(
x
+
4
)
(
x
−
4
)
(x+4)(x-4)
(
x
+
4
)
(
x
−
4
)
Done
(x+4)*(x-4)
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