Question

A-1 / a = 9, a2 + 1 / a2 =

Answer 1

Answer:

83

Step-by-step explanation:

$\implies$ $\sf{\left(a-{\Large\frac{1}{a}}\right)^2=a^2+{\Large\frac{1}{a^2}} -2 }$

$\implies$ $\sf{(9)^2=a^2+{\Large\frac{1}{a^2}}-2 }$

$\implies$ $\sf{a^2+{\Large\frac{1}{a^2}}=81+2 }$

$\implies$ $\boxed{\sf{a^2+\frac{1}{a^2}=83 }}$

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Answer 2

Step-by-step explanation:

In first,

a-1/a=9

a-1=9a

-1=9a-a

-1/8=a