Which of the following is the product of two integers whose sum is 18?  Select:
A) -42 B) -28 C) 12 D) 26 E) 32
I solved this Question like this,   Let the two integers are x,y   x+y=18 (Given)   xy=? (Needed)   instead of solving this algebraically, Test the Answer choices   E. 32   Do the factorization : (1,32)----&gt; There sum is not 18--eliminate   (2,16)----&gt;There sum is 18 Bingo!!!!   So, my answer is E...   As the answer is in E, it took me very less time to answer the question. but i think this method is be simple and efficient.
<result>E</result>
Which of the following is the product of two integers whose sum is 18?