Roots can occur in a parabola in 3 different ways as shown in the diagram below: In diagram A, we can see that this parabola has 2 roots, diagram B has 1 root and diagram C has no roots.

Laws of logarithms and exponents Revise what logarithms are and how to use the 'log' buttons on a scientific calculator Solving polynomial equations The nature and co-ordinates of roots can be ...