Inactive Tutor answered • 07/03/18
Tutor
New to Wyzant
a-1/a=4
Square both sides:
(a-1/a)2=42
a2-2+1/a2=16
a2+1/a2=18
Aman A.
asked • 07/03/18find and factorise
if a-1/a=4
find: a2+1/a2
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