title: Generating QR codes in google-spreadsheet
body: <p>I have a simple question about generating QR codes with google-spreadhseet.
  I am using google's API call</p>
  
  <pre><code>=image("https://chart.googleapis.com/chart?chs=150x150&amp;cht=qr&amp;chl="&amp;A3)
  </code></pre>
  
  <p>This works fine.
  Where <code>A3</code> is a persons first name. </p>
  
  <p>I have their last name in <code>A4</code> but when I try:</p>
  
  <pre><code>=image("https://chart.googleapis.com/chart?chs=150x150&amp;cht=qr&amp;chl="&amp;(A3+A4))
  </code></pre>
  
  <p>or</p>
  
  <pre><code>=image("https://chart.googleapis.com/chart?chs=150x150&amp;cht=qr&amp;chl="&amp;
  (CONCATENATE(A3, " ", A4)))
  </code></pre>
  
  <p>The QR box is blank.</p>
  
  <p>How can I generate a QR code from both the first and last name without having to create another field.</p>