0dd150a3-a02e-4555-aae4-8759e14b9842.html

<h4>Cool Down Activity</h4>
<div class="os-raise-ib-cta" data-button-text="Solution" data-fire-event="Reveal1" data-schema-version="1.0">
  <div class="os-raise-ib-cta-content">
    <p>A quadratic function is defined by the expression \(x^2&minus;20x+19\).</p>
    <p>Rewrite the expression in <span class="os-raise-ib-tooltip" data-schema-version="1.0" data-store="glossary-tooltip">vertex form (of a quadratic expression)</span> and give the coordinates of the <span class="os-raise-ib-tooltip" data-schema-version="1.0" data-store="glossary-tooltip">vertex (of a graph)</span>. Show your reasoning.</p>
  </div>
  <div class="os-raise-ib-cta-prompt">
    <p>Write down your answer, then select the <strong>solution</strong> button to compare your work.</p>
  </div>
</div>
<div class="os-raise-ib-content" data-schema-version="1.0" data-wait-for-event="Reveal1">
  <p>Compare your answer:</p>
  <p>\((x&minus;10)^2&minus;81\). The vertex is at \((10, -81)\).</p>
  <p>\(x^2&minus;20x+19\)<br>
    \(x^2&minus;20x+100+19&minus;100\)<br>
    \(x^2&minus;20x+100&minus;81\)<br>
    \((x&minus;10)^2&minus;81\)</p>
</div>