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Hello all. I am stuck on this homework problem. It wants me to find

[tex]

\frac {d^2y} {dx^2}

[/tex]

when [tex] y= ln x^8 [/tex]

The book answer is [tex] \frac {-8}{x^2}[/tex]

But I only can get [tex] \frac {-8}{x^9)}[/tex]

Please give me some guidance

Thanks

[tex]

\frac {d^2y} {dx^2}

[/tex]

when [tex] y= ln x^8 [/tex]

The book answer is [tex] \frac {-8}{x^2}[/tex]

But I only can get [tex] \frac {-8}{x^9)}[/tex]

Please give me some guidance

Thanks

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