title: Boolean Algebra Rule 10
body: <p>Hi I have a question about the following algebra rule</p>
  
  <p><em>A + AB = A</em></p>
  
  <p>My textbook explains this as follows
  <em>A + AB = A</em>
  This rule can be proved as such:</p>
  
  <ul>
  <li><p><strong>Step 1:</strong></p>
  
  <p><strong>Dustributive Law:</strong></p>
  
  <p>A + AB = A*1 = A(1+B) <strong><em>Huh...? Where do they get the one(1) from?</em></strong></p></li>
  <li><p><strong>Step 2:</strong></p>
  
  <p><em>1 + B = 1</em></p></li>
  <li><p><strong>Step 3:</strong></p></li>
  </ul>
  
  <p>: <em>A + 1 = A</em></p>
  
  <p>Thus
  <em>A + AB = A</em></p>
  
  <p>If anyone can clarify this for me it would be greatly appreciated</p>