title: How to evaluate a polynomial at a specific x-value?
body: <p>Use <code>map</code> to evaluate a given polynomial at a specific x-value.</p>
  <p>Input:</p>
  <ul>
  <li>p: A list of coefficients for increasing powers of x</li>
  <li>x: The value of x to evaluate</li>
  </ul>
  <p>Output: Number representing the value of the evaluated polynomial</p>
  <p>Example: <code>poly_eval([1, 2, 3], 2) = 1(2)^0 + 2(2)^1 + 3(2)^2 = 17</code></p>