12 Rationalizoze the denominator
√5 - 13
V5 +13
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(√5 - 13)/(V5 +13)
= (√5 - 13)(√5 - 13) / (V5 +13)(√5 - 13)
= (5-26√5+169) / (5 - 169)
= (174 -26√5)/(-154)
=> (26√5 - 174)/(154)
=> (13√5 - 87) / 77
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