1. ## solve

the zero of the polynomial 2x ^2009+3x^2008+2x^2007+3x^2006+.......+2x+3 is:

2. Originally Posted by vungaralas
the zero of the polynomial 2x ^2009+3x^2008+2x^2007+3x^2006+.......+2x+3 is:
Hint : $2x^{2009} + 3x^{2008} = x^{2008}(2x+3)$

You can factor out (2x+3)

3. ## clarify pls

can u give total solutions pls?

4. Here's a slightly different approach:
The polynomial can be written as follows:

$p(x) = \sum\limits_{m = 0}^{1004} {x^{2m} } + \sum\limits_{n = 1}^{1005} {x^{2n - 1} }$

now from the rational root theorem we know that the rational roots of the polynomial must be from the following group of possible solutions:

$\pm 1, \pm \frac{1}
{2}, \pm \frac{3}
{2}, \pm 3$

the positive solutions are obviously impossible, so now using the formula for the sum of the geometric progression we can easily find that the correct solution is:

$
- \frac{3}
{2}
$

5. ## thanx

thank u pls reapond to my following queries