Here is a start: d/dx(2x + 1)^1/2 = (1/2)(2x +1)-1/2 * 2 = 1/sqrt(2x+1) You should be able to apply the product rule: d/dx (u*v) = u dv/dx + v du/dx where u and v are functions of x.
You can ask a new question or answer this question.