The first two questions make use of the power rule.
The third,use d/dx (uv)=udv/dx+ vdu/dx
We will be happy to critique your work.
Differentiate the following
(1) 12x^3 - 6x - 2
(2) 1/4x^4 - 2x^2 + x + 5
(3) (ax + b)(cx + d)
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