Question

If x-1/x = 1/3 then 9x2 + 9/x2 is equal to​

Answer 1

Step-by-step explanation:

3, 3}

If f : A → B, such that y ∈ B, then

f−1

{ y }={x ∈ A: f (x) = y}.

In other words,

f−1

{ y} is the set of pre-images of y.

Let

f−1

9} = x

Then, f (x) = 9

⇒ x2 = 9

⇒ x = ± 3

∴

f−1

{9} = {- 3, 3}.

.

.

.

mark me as brain3, 3}

If f : A → B, such that y ∈ B, then

f−1

{ y }={x ∈ A: f (x) = y}.

In other words,

f−1

{ y} is the set of pre-images of y.

Let

f−1

9} = x

Then, f (x) = 9

⇒ x2 = 9

⇒ x = ± 3

∴

f−1

{9} = {- 3, 3}.

mark me as brainlist