Differentiation

Question 1

when asked to find eqn of a tangent

Answer 1

-differentiate to find gradient
-use og equation to find x or y
-but into straight line eqn

Question 2

when asked to coordinates and stat. points on a curve

Answer 2

-differentiate
-make dy/dx =0
- factorise to find stat points
- feed back into original eqn to find y
- use nature table to find the nature of the line

Question 3

when talking about finding area and minimum

Answer 3

-differentiate
-make dy/dx =0
- find missing point eg x or r
- use nature table to find the nature of the line

Question 4

optimisation

Answer 4

-differentiate
-make dy/dx =0
- find missing point eg x or r
- use nature table to find the nature of the line