If a=9-4root 5 find the value of a-1/a whole square
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Answer:
a=9-4√5
1/a=1/(9-4√5)
=1*(9+4√5)/(9)2-(4√5)2
=(9+4√5)/81-80
=9+4√5
(a + 1/a)² - 2a(1/a)
= ( 9 - 4√5 + 9 + 4√5)² - 2
= 18² - 2
= 324 - 2
= 322
Step-by-step explanation:
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