How do you simplify #–2(a + 3b) + 4(2a – 3b)#? Algebra Polynomials and Factoring Addition and Subtraction of Polynomials 1 Answer Don't Memorise Jun 11, 2015 # =color(red)( 6a - 18b# Explanation: #–2(a+3b) = color(blue)(-2a -6b# #4(2a–3b) =color(red)( 8a -12b# Combining: #=color(blue)(-2a -6b + color(red)( 8a -12b# Grouping like terms : # = (-2a + 8a) + (-6b - 12b)# # =color(red)( 6a - 18b# Answer link Related questions How do you add two polynomials? How do you subtract two polynomials? How do you add and simplify #3x^2-4x+7# and #2x^3-4x^2-6x+5#? How do you subtract #5b^2-2a^2# from #4a^2-8ab-9b^2#? How do you simplify #(6.9a^2-2.3b^2+2ab)+(3.1a-2.5b^2+b)#? How do you simplify #(-t+15t^2)-(5t^2+2t-9)#? How do you subtract #(-5m^2-m)-(3m^2+4m-5)#? How do you add two polynomials if they don't have like terms? How do you simplify #(3a+4b)-(-6a-3b)#? How do you subtract #(x^2-8x+7)-(6x^2+7x-3)#? See all questions in Addition and Subtraction of Polynomials Impact of this question 2170 views around the world You can reuse this answer Creative Commons License