How do you combine #5x(3x) – 15(2x)#? Algebra Polynomials and Factoring Multiplication of Monomials by Polynomials 1 Answer Alan P. Jun 3, 2015 #5x(3x) - 15(2x)# can not be combined into a single term, however the following forms may be acceptable: #= 15x^2 -30x# or #= 15x(x-2)# Answer link Related questions What is Multiplication of Monomials by Polynomials? How do you multiply monomials by polynomials? How do you multiply monomials by monomials? How do you multiply #(3xy^5)(-6x^4y^2)#? How do you multiply and simplify #6ab(-10a^2 b^3+c^5)#? How do you simplify #-3a^2b(9a^2-4b^2)#? How do you multiply #y(xy^4)#? How do you multiply #(2x-1)(x^3-2x^2+3x-4)#? How do you multiply #(5n^2)(2n^5 - 2n^3 3n^7)#? How do you simplify #2t^2+(3+5)(4t)#? See all questions in Multiplication of Monomials by Polynomials Impact of this question 1552 views around the world You can reuse this answer Creative Commons License