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Find the derivative of the function:

\[ y = x^{-9} + x^{-9} - 6 + x - 1 \]

\[ y'(x) = -9x^{-10} - 9x^{-10} + 1 \]

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Find the derivative of the function:

\[ y = 9x^5 - 4x^3 + 5x - 8 \]

\[ y' = 45x^4 - 12x^2 + 5 \]

Answer :

The derivative of the function y = [tex]x^{-9}+x^{-6}+x^{-1}[/tex] is given by y' = [tex]-9x^{-10}-6x^{-7}-\ln x[/tex] and the derivative of the function y = 9x⁵ - 4x³ + 5x - 8 is given by 45x⁴ - 12x² +5.

The function given is,

y = [tex]x^{-9}+x^{-6}+x^{-1}[/tex]

In the above function, independent variable is 'x' and dependent variable is 'y'.

Differentiating the above function with respect to 'x' we get,

dy/dx = d/dx [tex](x^{-9}+x^{-6}+x^{-1})[/tex]

y'(x) = [tex]-9x^{-9-1}-6x^{-6-1}-\ln x=-9x^{-10}-6x^{-7}-\ln x[/tex]

Another function is,

y = 9x⁵ - 4x³ + 5x - 8

Differentiating the above function with respect to 'x' we get,

y' = 9*5x⁴ - 4*3x² + 5 - 0 = 45x⁴ - 12x² +5

Hence the derivative functions are [tex]-9x^{-10}-6x^{-7}-\ln x[/tex] and 45x⁴ - 12x² +5.

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