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factor xsquared-7x-30 completely

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( X+ a)( X+b) = X2 + ( a+b)X+ ab
 
   This is a general formula, where Multiplying binomial by binomial result in a trinomial( polynomial of 2nd degree or quadratic).
     You have to be able to factor any quadratic 2 two binomial, and solve it.
     and expand it.
 
      ( X-1) ( X +30) = X+ 29X - 30
       
       ( X - 5) ( X +6 ) = X+ X -30
 
        ( X + 2) ( X -15) = X2 - 13X - 30    You see that Coeficient of X is ( a+b) and constant is ab