Fairy1108789 Fairy1108789
  • 03-08-2018
  • Mathematics
contestada

find the inverse function for f(x) = cubic root sqrt x+2

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rejkjavik rejkjavik
  • 03-08-2018

we are given

[tex] f(x)=\sqrt[3]{x+2} [/tex]

Firstly , we set f(x)=y

[tex] y=\sqrt[3]{x+2} [/tex]

now, we can switch x and y

[tex] x=\sqrt[3]{y+2} [/tex]

now, we can solve for y

[tex] x^3=(\sqrt[3]{y+2})^3 [/tex]

[tex] x^3=y+2 [/tex]

[tex] y=x^3-2 [/tex]

so, our inverse function is

[tex] f^{-1}(x)=x^3-2 [/tex]............Answer

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gmany
gmany gmany
  • 03-08-2018

[tex]f(x)=\sqrt[3]{x+2}\to y=\sqrt[3]{x+2}[/tex]

we replace x with y

[tex]\sqrt[3]{y+2}=x\ \ \ \ |^3\\\\y+2=x^3\ \ \ \ |-2\\\\y=x^3-2[/tex]

Answer: [tex]f^{-1}(x)=x^3-2[/tex]

Answer Link

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