



 
Hi Amanda, The expressions for factoring the sum and difference of cubes are
If you add or subtract algebraic fractions you need to find a common denominator just as in adding or subtracting numerical fractions. For your example a common denominator is (x + h + 2)(x + 2). Thus multiply the numerator and denominator of the first fraction by x + 2 and the numerator and denominator of the second fraction by x + h + 2. This gives Now that the fractions have the same denominator you can subtract the numerators I hope this helps,  


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