Question

${ {a}^{2} - 4a } - 1 = 0 \: find \: {a }^{2} - \frac{1}{ {a}^{2} }$
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Answer 1

Answer:

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Step-by-step explanation:

a2 -4a =1 dividing by a

a-4=1/a

a-1/a=4

on squaring both sides

a2-2+1/a2=16

a2+1/a2=16+2=18