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Powers and Roots Practice Test 1
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© examsnet.com
Question : 6
Total: 40
If
x
=
2
+
√
5
and
y
=
2
−
√
5
, find the value of
(
x
2
+
y
2
)
:
18
19
20
21
22
Validate
Solution:
👈: Video Solution
x
=
2
+
√
5
and
y
=
2
−
√
5
,
∴
(
x
2
+
y
2
)
=
(
2
+
√
5
)
2
+
(
2
−
√
5
)
2
=
4
+
5
+
4
√
5
+
4
+
5
−
4
√
5
=
18
© examsnet.com
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