title: unsupported operand type(s) error
body: <pre><code>a = 3,3 b = 5,3
  a2 = a**2
  b2 = b**2
  eq1_sum = a2 + 2ab + b2
  eq2_sum = a2 - 2ab + b2
  eq1_pow = (a + b)**2
  eq2_pow = (a - b)**2
  print ’First equation: %g = %g’, % (eq1_sum, eq1_pow)
  print ’Second equation: %h = %h’, % (eq2_pow, eq2_pow)
  </code></pre>
  
  <p>This program it shows error:</p>
  
  <blockquote>
    <p>TypeError: unsupported operand type(s) for ** or pow(): 'tuple' and 'int'</p>
  </blockquote>