a²-4a-1=0 find the value of a²-1/a²
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Answer:
18
Step-by-step explanation:
a²-4a=1 is dividing by a
a-4=1/a
a-1/a=4
on squaring on both sides
a²-2+1/a²=4²
a²-2+1/a²=16
a²+1/a² = 16+2
= 18
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