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Foundations
medium
0:00.0
Simplify:
(
3
x
−
1
)
(
3
x
+
1
)
−
9
x
2
(3x-1)(3x+1)-9x^2
(
3
x
−
1
)
(
3
x
+
1
)
−
9
x
2
.
A
−
1
-1
−
1
B
1
1
1
C
18
x
18x
18
x
D
0
0
0
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