Hi

To find stationery points I always differentiate the function which in my previouas work has always resulted in a quadratic equation so set to zero and factorise or find roots.

But what to do if gradient is eg x^-2 ???

the function is 4x^2 + 1/x

dy/dx = 8x - x^-2

8x - x^-2 = 0 ??? How do I solve this?

Angus