How do you factor completely #3x^2 + 4x -15#? Algebra Polynomials and Factoring Factoring Completely 1 Answer Özgür Özer Dec 24, 2015 #color(white)xx3x^2+4x-15=3(x-5/3)(x+3)# Explanation: #color(white)xx3(x-5/3)(x+3)=3(x^2+3x-(5x)/3-5)# #color(white)(xxxxxxxxxxxxxx)=3(x^2+(9x-5x)/3-5)# #color(white)(xxxxxxxxxxxxxx)=3x^2+4x-15# Answer link Related questions What is Factoring Completely? How do you know when you have completely factored a polynomial? Which methods of factoring do you use to factor completely? How do you factor completely #2x^2-8#? Which method do you use to factor #3x(x-1)+4(x-1) #? What are the factors of #12x^3+12x^2+3x#? How do you find the two numbers by using the factoring method, if one number is seven more than... How do you factor #12c^2-75# completely? How do you factor #x^6-26x^3-27#? How do you factor #100x^2+180x+81#? See all questions in Factoring Completely Impact of this question 4099 views around the world You can reuse this answer Creative Commons License