How do you factor #x^2 - 13x +42#? Algebra Polynomials and Factoring Factorization of Quadratic Expressions 1 Answer George C. May 25, 2015 Note that #(x-a)(x-b) = x^2-(a+b)x+(axxb)# Also note that #13 = 6 + 7# and #42 = 6 xx 7# So #x^2-13x+42 = (x-6)(x-7)# Answer link Related questions How do you factor trinomials? What is factorization of quadratic expressions? How do you factor quadratic equations with a coefficient? What are some examples of factoring quadratic expressions? How do you check that you factored a quadratic correctly? How do you factor #x^2+16x+48#? How do you factor #x^2-9x+20#? Question #3fdac How do you factor #8+z^6#? There is no GCF to be factor out, so is there another method to complete this? How do you factor #2t^2+7t+3#? See all questions in Factorization of Quadratic Expressions Impact of this question 21843 views around the world You can reuse this answer Creative Commons License