Answer
$y'=6(x^2-5x)^5-2(x^2-5x)^6(2x-5)^{-2}$
Work Step by Step
Take the derivative of y and apply chain rule:
$y'=(2x-5)^{-1}\times6(x^2-5x)^5\times(2x-5)+(x^2-5x)^6\times-1(2x-5)^{-2}\times2=6(x^2-5x)^5-2(x^2-5x)^6(2x-5)^{-2}$
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