This problem is from the Mathematics Knowledge section of the ASVAB.  It involves factoring in algebra.  This is a  key topic that I present in my ASVAB prep course.  Many students who want to help with ASVAB math will be able to improve their score on Mathematics Knowledge when they improve their skills in algebra.  One thing to look for in ASVAB tutors is a  focus on algebra in preparing you for the exam.  Algebra is a  key part of this test that needs to be mastered.  Tomorrow I will post the explanation of how to solve this problem.  What do you think the answer is?  Stay tuned for the answer and explanation!