im lost in how to do this

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im lost in how to do this

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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this is it
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Wow i dont know how to do that sorry lol :O
its all good

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i just am really lost
i wish i would help you .sorry
First write \(f(x) = x^2 - 81\) Then let \(y = f(x)\): \(y = x^2 - 81\) Next, swap \(x\) and \(y\) \(x = y^2 - 81\) Afterwards, isolate \(y\). @Player_2 Would you like to try isolating y?
ill try
u square root y^2?
then i get lost
  • phi
x=y^2 - 81 I would first add +81 to both sides , as the next step. what do you get?
81x=y^2
  • phi
like this x+81 = y^2 - 81+81
  • phi
on the right side you have -81+81 and that simplifies to 0 and y^2 +0 is y^2 so you now have x+81= y^2 or y^2 = x+81 now you can "take the square root" of both sides
im a bit confused what to do 81x
  • phi
there is no 81x what do you mean ?
x+81

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