How do you factor #7a^3 - 21a^2#? Algebra Polynomials and Factoring Monomial Factors of Polynomials 1 Answer Nityananda Dec 22, 2016 #7a^2 (a - 3)# Explanation: #7a^3 - 21a^2# = #7.a.a.a - 7.3.a.a# = 7.a.a (a - 3) = #7a^2 (a-3)# Answer link Related questions What are Monomial Factors of Polynomials? How do you factor polynomials by finding the greatest common factor? How can a factoring problem be checked? How do you find the greatest common factors of variable expressions? How do you factor #3a+9b+6#? What is the greatest common factor of #a^3-3a^2+4a#? How do you factor #12xy+24xy^2+36xy^3#? How do you find the greatest common factor of #45y^{12}+30y^{10}#? How do you factor #92x^10y^4 - 54x^12y^9#? How do you factor #4x^2+x#? See all questions in Monomial Factors of Polynomials Impact of this question 2892 views around the world You can reuse this answer Creative Commons License