simplify each of the following
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it is very easu
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RATIONALISATION
√5-2/√5+2*√5-2/√5-2
(√5-2)²=5+4-4√5
=9-4√5
√5+2/√5-2*√5+2/√5+2
(√5+2)²=5+4+4√5
=9+4√5
9-4√5-9-4√5
⇒-8√5
√5-2/√5+2*√5-2/√5-2
(√5-2)²=5+4-4√5
=9-4√5
√5+2/√5-2*√5+2/√5+2
(√5+2)²=5+4+4√5
=9+4√5
9-4√5-9-4√5
⇒-8√5
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