4.Rationalize the denominator of 1/√18-√32
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Answer:
+
32
=
27
−
18
48
+
32
×
27
+
18
27
+
18
=
27−18
(
48
+
32
)(
27
+
18
)
[∵a
2
−b
2
=(a−b)(a+b)]
=
27−18
(48×27+48×18+32×27+32×18)
=
9
(1296+864+864+576)
=
9
3600
=400
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