28) Factorise:
a)8x3
-343y3
b) (x+2y)3
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2
Explanation:
In general the difference of cubes can be factored as:
XXX
a
3
−
b
3
=
(
a
−
b
)
(
a
2
+
a
b
+
b
2
)
For the given example:
a
3
=
8
x
3
=
(
2
x
)
3
and
b
3
=
y
3
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