title: How would I get the sum of squares of two Lists in Scala?
body: <p>If I have two lists</p>
  
  <pre><code>val first = List(1, 2, 3)
  val second = List(4, 5, 6)
  </code></pre>
  
  <p>How would I obtain the following?</p>
  
  <pre><code>(1-4)^2 + (2-5)^2 + (3-6)^2
  </code></pre>