F flon Member Joined Feb 17, 2008 Messages 30 Gender Male HSC 2010 Feb 17, 2009 #1 In the expansion of (ax+b)^6, the coefficient of x^4 is 2160 and the coefficient of x^5 is -576. Find a and b. Thanks guys
In the expansion of (ax+b)^6, the coefficient of x^4 is 2160 and the coefficient of x^5 is -576. Find a and b. Thanks guys
L lolokay Active Member Joined Mar 21, 2008 Messages 1,015 Gender Undisclosed HSC 2009 Feb 17, 2009 #2 there will be 2 answers, since it's an even power (you can factor out the -1) like how (x+1)2 = (-x-1)2
there will be 2 answers, since it's an even power (you can factor out the -1) like how (x+1)2 = (-x-1)2
F flon Member Joined Feb 17, 2008 Messages 30 Gender Male HSC 2010 Feb 17, 2009 #3 Thanks. It helped a lot. Well done.
