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(
x
+
3
)
(
x
−
3
)
(x+3)(x-3)
(
x
+
3
)
(
x
−
3
)
+
−
.
ln
>
<
×
÷
/
log
≥
≤
(
)
log
x
=
%
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"(x+1)/2+4=7"
"factor x^2+5x+6"
"integrate cos(x)^3"
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expand((x+3)(x-3))
expand (x+3)(x-3)
(x+3)(x-3)
1
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
2
−
3
2
{x}^{2}-{3}^{2}
x
2
−
3
2
2
Simplify
3
2
{3}^{2}
3
2
to
9
9
9
.
x
2
−
9
{x}^{2}-9
x
2
−
9
Done
x^2-9
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