If y = (2x + 1)3 find dy/dx

At what value of X does the function y = -3 - 2x + X2 attain a minimum value?

What value of x will make the function x(4 - x) a maximum?

Find the derivative of the function y = 2x\(^2\)(2x - 1) at the point x = -1?

find the limit of y = \(\frac{x^3 + 6x - 7}{x-1}\) as x tends to 1