How do you simplify # (-9x^2 - 4x - 4) - (-9x^2 - 11x + 12)#? Algebra Polynomials and Factoring Addition and Subtraction of Polynomials 1 Answer Don't Memorise Jun 18, 2015 # =color(blue)(7x -16# Explanation: # (-9x^2 - 4x - 4) - (-9x^2 - 11x + 12)# # =-9x^2 - 4x - 4 +9x^2 + 11x - 12# Grouping like terms: # =color(red)((-9x^2 +9x^2)) +color(blue)((-4x + 11x)) -4 - 12# # =0 +color(blue)(7x) -16# # =color(blue)(7x -16# 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 1416 views around the world You can reuse this answer Creative Commons License