you differentiate it, then put your answer equal to zero. Also this is on the normal IGCSE syllabus, cos i have my exam tomorrow and it is one of the topics i am revision
Differentiate, set this equal to 0 to find stationary points.
Check values either side of any stationary points to see whether they are minimum or maximum
There's no need to check. A quadratic graph has the shape of a parabola, and if the coefficient of x^2 is positive, it will only have one minimum point and no other stationary points.
There's no need to check. A quadratic graph has the shape of a parabola, and if the coefficient of x^2 is positive, it will only have one minimum point and no other stationary points.
I think you'll find plenty of new threads to reply to.