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anonymous

  • one year ago

im lost in how to do this

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  1. anonymous
    • one year ago
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    this is it

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  2. anonymous
    • one year ago
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    Wow i dont know how to do that sorry lol :O

  3. anonymous
    • one year ago
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    its all good

  4. anonymous
    • one year ago
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    i just am really lost

  5. anonymous
    • one year ago
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    i wish i would help you .sorry

  6. Hero
    • one year ago
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    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?

  7. anonymous
    • one year ago
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    ill try

  8. anonymous
    • one year ago
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    u square root y^2?

  9. anonymous
    • one year ago
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    then i get lost

  10. phi
    • one year ago
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    x=y^2 - 81 I would first add +81 to both sides , as the next step. what do you get?

  11. anonymous
    • one year ago
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    81x=y^2

  12. phi
    • one year ago
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    like this x+81 = y^2 - 81+81

  13. phi
    • one year ago
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    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

  14. anonymous
    • one year ago
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    im a bit confused what to do 81x

  15. phi
    • one year ago
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    there is no 81x what do you mean ?

  16. anonymous
    • one year ago
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    x+81

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spraguer (Moderator)
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