Evaluate sqrt of (2003)(2005)(2007)(2009)+16 by using algebraic method.

3 answers

Let a = 2006. Then you have
(a-3)(a-1)(a+1)(a+3) = (a-1)(a+1)*(a-3)(a+3) = (a^2-1)(a^2-9)
Let b = a^2+4 = 2006^2+4. Now you have
= (b-5)(b+5) = b^2-25

Hmmm. Stuck here so far.
Anyone see a way out?
Oops. My bad.
Let b = a^2-5 = 2006^2-5. Now you have
= (b+4)(b-4) = b^2-16

So,
(b^2-16 + 16 = b^2 = (2006^2-5)^2

So,
√((2003)(2005)(2007)(2009)+16) = 2006^2-5 = 4024031
heroic. I was doing similar scratching for about half an hour :)
Similar Questions
    1. answers icon 1 answer
  1. Year2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 gas price 0.70 1.04 1.15 1.38 1.86 1.70 2.55 1.29 2.22 2.56 does this have
    1. answers icon 1 answer
    1. answers icon 2 answers
  2. 2002, 0.702003, 1.04 2004, 1.15 2005, 1.38 2006, 1.86 2007, 1.70 2008, 2.55 2009, 1.29 2010, 2.22 2011, 2.56 list the domain of
    1. answers icon 3 answers
more similar questions