anonymous
  • anonymous
im lost in how to do this
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
this is it
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anonymous
  • anonymous
Wow i dont know how to do that sorry lol :O
anonymous
  • anonymous
its all good

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anonymous
  • anonymous
i just am really lost
anonymous
  • anonymous
i wish i would help you .sorry
Hero
  • Hero
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?
anonymous
  • anonymous
ill try
anonymous
  • anonymous
u square root y^2?
anonymous
  • anonymous
then i get lost
phi
  • phi
x=y^2 - 81 I would first add +81 to both sides , as the next step. what do you get?
anonymous
  • anonymous
81x=y^2
phi
  • phi
like this x+81 = y^2 - 81+81
phi
  • 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
anonymous
  • anonymous
im a bit confused what to do 81x
phi
  • phi
there is no 81x what do you mean ?
anonymous
  • anonymous
x+81

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