Question 201759
Please put parentheses around each numerator and each denominator. Without them there are way too many ways to interpret: 
X^2-3x-4/X^2-16 / 3x+3/X^2+9x+20<br>
I'll give you some general tips:<ol><li>If division of fractions is indicated, change the division to multiplying by the reciprocal of the second fraction</li><li>Factor the numerators and denominators.</li><li>See if the fractions will reduce by canceling common factors (remembering to "cross cancel" if there fractions being multiplied).</li><li>If fractions need to be added or subtracted<ol><li>You will need common denominators of course.</li><li>The Lowest Common Denominator (LCD) will be the product of all the different factors in the various denominators.</li><li>To turn each denominator into the LCD, multiply the numerator and denominator of each fraction by whatever factors of the LCD are "missing" from its denominator, if any.</li><li>Multiply out the numerators but leave the denominators factored (so we can reduce the answer later more easily).</li><li>Now that the denominators are the same, add or subtract the numerators.</li><li>Factor the new numerator, if possible</li><li>Reduce your final fraction by canceling common factors, if any</li><li>After reducing, multiply out any numerators or denominators are still factored</li</ol></ol>