ass="p">(</span><span class="n">x</span><span class="o">**</span><span class="mi">4</span><span class="p">)</span><span class="o">-</span><span class="mf">0.525</span><span class="o">*</span><span class="p">(</span><span class="n">x</span><span class="o">**</span><span class="mi">3</span><span class="p">)</span><span class="o">+</span><span class="mf">0.75</span><span class="o">*</span><span class="p">(</span><span class="n">x</span><span class="o">**</span><span class="mi">2</span><span class="p">)</span><