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How do I use the zero-factor property?

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When a quadratic( Trinomial )  is factored to  two binomial : i.e.
 
X- 13X + 36  = ( X - 4 ) ( X- 9 )
 
  To solve for their roots , zeros or X - intercept of the graph of quadratic, the value of X's that make
 
 expression X2 - 13X + 36 =0
 
   We let:
   ( X- 4 ) ( X-9 ) = 0
 
    Here we use the law of multiplication by 0, i.e. every number multiplied by 0 results in 0.
 
     Let one X- 4 = 0 , X =4 , then X -9 = 0  X =9.