Chapter 11 - Rational Expressions and Functions - 11-4 Adding and Subtracting Rational Expressions - Practice and Problem-Solving Exercises - Page 675: 22

$ab^2c$

To find the LCD, or the Least Common Multiple,we must write out each denominator as products of prime factors. $ab = a \times b$ $b^2c = b \times b \times c $ The Least Common Multiple, or LCD, then is $a\times b\times b\times c = ab^2c$