Differentiate with respect to x the following function

y=1/x-4/x^3+3/x^4
and
y=(x-1)^2
_
x^2

The factorization of 8x3 -125 is (2x-5)(jx2 +kx+25)

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What are the solutions of the equation? 6x^2 + 11x + 4 = 0 a. 4/3, 1/2 b. -4/3, -1/2 c. 4/3, -1/2 d. -4/3, 1/2