# How we know that our prooving of any problem is right

Verification of problem depends on its type:

>If problem is of “prove that” type, then simply if LHS = RHS then answer is correct.

>If problem is of “factorization” type, then substitution of values of factorized answer must result in ‘0’. Ex: Factorize (x – 7) = 0. Here, putting x = 7 gives correct answer hence problem is right.

>If problem is just about solving type, check all the steps carefully twice to see there are no mistakes made.