You porobably got this answer by first simplifying the function as follows:

x2 x5

=

1 x3

.

This is correct. However, the derivative of a quotient is not the quotient of the derivatives. In other words,

d dx

1 x3

0 3x2

.

To find the correct derivative, first express 1/x³ in exponent form (x raised to some power).

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