Rational Expressions
<p>We know that in the <code>dominator</code>, the <code>x</code> can't be <code>-6</code> or <code>-4</code> because the dominator mustn't be zero. And <code>-6 and -4</code> makes <code><strong>discontinuities</strong></code> of the function.</p>
<p>Further more, we could <strong>CANCEL OUT</strong> <code>(x+4)</code> from both numerator and dominator.<br />
And this makes <code>(x+4)</code> REMOVABLE, so that the <code>-4</code> become a <code><strong>Removable discontinuity</strong></code>.</p>
<p>Now what’s left here is this fraction:</p>
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