Question

if a is 9 minus 4 root 5 find the value of a minus 1 by a whole square plzzz do it in step by step process​

Answer 1

a=9-4√5

1/a=9-4√5(By Rationalization)

{a-(1/a)}^2

=(9-4√5+9+4√5)^2

=18^2

=324

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