<p>If the product of two ploynomials is &nbsp;<span class="math-editor mathquill-rendered-math"><span class="roman font"><var>x</var></span><sup class="non-leaf">4</sup><span class="binary-operator">+</span>5<var>x</var>&sup3;<span class="binary-operator">&minus;</span>6<var>x</var>&sup2;<span class="binary-operator">&minus;</span>2<var>x</var><span class="binary-operator">&minus;</span>28</span> and their HCF is &nbsp;<span class="math-editor mathquill-rendered-math"><var>x</var><span class="binary-operator">&minus;</span>2</span>&nbsp; . Find their LCM.</p>