This leads to, two ways of proving a proposition
directly or indirectly and the proofs obtained are called direct proof and indirect proof
and further each has three different ways of proving which is discussed below Direct Proof  It is the proof of a proposition in which we directly start the proof with
what is given in the proposition (i)
Straight forward approach It is a chain of arguments which leads directly from
what is given or assumed,  with the help of axioms, definitions or already proved
theorems, to what is to be proved using rules of logic Consider the following example:
Example 1 Show that if x2 – 5x + 6 = 0, then x = 3 or x = 2