if a = 9 minus 4 root 5. Find the value of root a minus one upon root a
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a=9-4√5
1\a=1/9-4√5×9+4√5
1\a=9+4√5
a-1/a=9-4√5 -(9+4√5)
=-8√5
1\a=1/9-4√5×9+4√5
1\a=9+4√5
a-1/a=9-4√5 -(9+4√5)
=-8√5
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