difference between (3+√5) and (-3+√5)
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(
3
+
√
5
)
(
3
−
√
5
)
This is an example of the difference of squares,
(
a
2
−
b
2
)
=
(
a
+
b
)
(
a
−
b
)
, where
a
=
3
and
b
=
√
5
.
(
3
2
−
√
5
2
)
=
9
−
√
5
2
Apply the square root rule
√
x
2
=
x
.
9
−
5
=
4
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