분해 인수 2009 + 2009 ^ 2 - 2010 ^ 2

분해 인수 2009 + 2009 ^ 2 - 2010 ^ 2

2009 + 2009 & sup 2; - 2010 & sup 2;
= 2009 - (2010 & sup 2; - 2009 & sup 2;)
= 2009 - (2010 - 2009) (2010 + 2009)
= 2009 - (2010 + 2009)
= 2009 - 2010 - 2009
= - 2010