Reference
Practice
Premium
Log In
English
English ✔
Español
日本語
简体中文
繁體中文
x
2
−
9
{x}^{2}-9
x
2
−
9
+
−
.
ln
>
<
×
÷
/
log
≥
≤
(
)
log
x
=
%
Choose Topic
Examples
"(x+1)/2+4=7"
"factor x^2+5x+6"
"integrate cos(x)^3"
More »
factor(x^2-9)
factor x^2-9
{x}^{2}-9
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
=
3
b=3
b
=
3
.
x
2
−
3
2
{x}^{2}-{3}^{2}
x
2
−
3
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
+
3
)
(
x
−
3
)
(x+3)(x-3)
(
x
+
3
)
(
x
−
3
)
Done
(x+3)*(x-3)
Like this solution? Share it!
Copy Link
How can we make this solution more helpful?
English
Choose Topic
