You need to use quotient rule to differentiate the function with respect to x, hence, you need to assign two functions to numerator and denominator, such that: `g(x) = 8x, h(x) = x^5 + 3` .

You need to remember the quotient rule, such that:

`f'(x) = (g'(x)h(x) - g(x)h'(x))/(h^2(x))`

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You need to use quotient rule to differentiate the function with respect to x, hence, you need to assign two functions to numerator and denominator, such that: `g(x) = 8x, h(x) = x^5 + 3` .

You need to remember the quotient rule, such that:

`f'(x) = (g'(x)h(x) - g(x)h'(x))/(h^2(x))`

Replacing 8 for g'(x) and `5x^4` for h'(x) yields:

`f'(x) = (8(x^5 + 3) - 8x(5x^4))/((x^5 + 3)^2)`

`f'(x) = (8x^5 + 24 - 40x^5)/((x^5 + 3)^2)`

`f'(x) = (24 - 32x^5)/((x^5 + 3)^2)`

`f'(x) = 8(3 - 4x^5)/((x^5 + 3)^2)`

**Hence, evaluating the derivative of the given function, by quotient rule, yields **`f'(x) = 8(3 - 4x^5)/((x^5 + 3)^2).`