title: Draw quadratics with it crossing the x and y axis with points labled
body: <p>I'm trying to draw curves and I need to have it crossing the x and y axis with where it crossing shown clearly on the graph.
  Im using the code </p>
  
  <pre><code>curve(x^2-8*x+16, -2, 10)
  </code></pre>
  
  <p>this is making the curve I want but not showing the curve clearly crossing the axis</p>
  
  <p><img src="https://i.stack.imgur.com/oaclY.png" alt="picture of the graph from RStudio"></p>
  
  <p>I have used Desmos to show what im aiming to create.</p>
  
  <p><img src="https://i.stack.imgur.com/E7btZ.png" alt="Picture of the desired graph"></p>