Equation of a normal to a curve
- Find the derivative f ’(x) of the given function, this will be merely the equation of the gradient for that function.
- Substitute in the x-coordinates of the given point in the derivative to find the gradient at this point.
- The gradient of the normal is; m = 1/(dy/dx) which is the gradient you need to use in the following formula. Place the found values in the following formula. You will need the m which is the gradient, x-coordinate which is the given value and the y-coordinate, you find this by substituting it in the original function. You might be required or for your purpose to write the equation of the normal in this form;
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