How do you factor 2h^3+h^2-18h-9 by grouping? Algebra Polynomials and Factoring Factoring by Grouping 1 Answer Deepak G. Jul 30, 2016 =(2h+1)(h+3)(h-3) Explanation: 2h^3+h^2-18h-9 =h^2(2h+1)-9(2h+1) =(2h+1)(h^2-9) =(2h+1)(h+3)(h-3) Answer link Related questions What is Factoring by Grouping? How do you factor by grouping four-term polynomials and trinomials? Why does factoring polynomials by grouping work? How do you factor 2x+2y+ax+ay? How do you factor 3x^2+8x+4 by using the grouping method? How do you factor 6x^2-9x+10x-15? How do you group and factor 4jk-8j^2+5k-10j? What are the factors of 2m^3+3m^2+4m+6? How do you factor quadratics by using the grouping method? How do you factor x^4-2x^3+5x-10? See all questions in Factoring by Grouping Impact of this question 1467 views around the world You can reuse this answer Creative Commons License