There should not be any y in the derivative itself since y or y(x) is the function whose derivative you are finding.
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16x + 5 can't be solved any further without more information.
The given expressions can be simplified to: 16x-10
16X + 5
It is 16x/5 or 3.2x
To factorise x3 + 5x2 - 16x - 80 I note that -80 = 5 x -16 and 5 & -16 are the coefficients of x2 and x. Thus I have: x3 + 5x2 - 16x - 80 = (x + 5)(x2 - 16) and the second term is a difference of 2 squares, meaning I have: x3 + 5x2 - 16x - 80 = (x + 5)(x + 4)(x - 4)