I'm having trouble with this question, because the 1/3 power is making my life very difficult! I dont have class for the next couple of days and without a teacher to ask, the question's driving me crazy! the question is find the stationary points for y = (8 +5x^2)^1/3 using algebraic calculus I was able to find the derivative, dy/dx = 1/3(8+5x^2)^-2/3 times 10x = 10/3(8+5x^2)^-2/3 = 10x (above) 3(8+5x^2)^2/3 I also know to make dy/dx = 0, but when I try to work it out I somehow get to 392^3/2 + 15x^11/2 - 10x = 0 I have no idea how I got there! I'm really confused over the fractional power, and no examples I have with me deal with it! If anyone could help in some way, I'd really appreciate it. Thanks.