title: Root of quadratic polynomial with Python
body: <p>I know this is asking me to use if statements. But how can I go about doing this?</p>
  <p>Write a program qroots.py that reads three floats a, b, c from the command line and computes/prints the roots of the quadratic polynomial <code>ax**2 + bx + c = 0</code>. Your program needs to handle only the case when real roots exist, i.e., when the values of a, b, c produce a non-negative discriminant <code>b**2 − 4ac &gt;= 0</code>.</p>
  <p>When the discriminant is negative your program should only print a message that no real roots exist.</p>
  <p>Hint: math.sqrt() is the built-in function that returns the square root of a number.</p>
  <p>I have this so far:</p>
  <pre><code>import sys
  import math
  
  a = float(sys.argv[1])
  b = float(sys.argv[2])
  c = float(sys.argv[3])
  </code></pre>
  <p>Terminal should do this:</p>
  <blockquote>
  <p>qroots.py 1 -3 2</p>
  <p>1.0 2.0</p>
  </blockquote>