What is the LCM of 8y, #18y^3 #? Algebra Rational Equations and Functions Addition and Subtraction of Rational Expressions 1 Answer Konstantinos Michailidis Oct 2, 2015 It is #72y^3# Explanation: You need #y^3# and the factors of #8# which is #2^3# and of #18 = 2*3^2# so: #2^3*3^2*y^3 = 72*y^3# Answer link Related questions What is Addition and Subtraction of Rational Expressions? How do you add or subtract rational expressions with the same denominator? How do you add or subtract rational expressions with unlike denominator? How do you find the least common denominator for rational expressions? How do you simplify #\frac{2}{x+2}-\frac{3}{2x-5}#? How do you add #\frac{5}{2x+3}+\frac{3}{2x+3}#? What is the least common denominator for #\frac{2x}{x-4}+\frac{x}{4-x}#? How do you add #\frac{3x-2}{x-2}+\frac{1}{x^2-4x+4}#? How do you subtract #\frac{2x}{x^2+10x+25}-\frac{3x}{2x^2+7x-15}#? How do you add #3/(2x-4)+x/(x+2)#? See all questions in Addition and Subtraction of Rational Expressions Impact of this question 2075 views around the world You can reuse this answer Creative Commons License