Binomial Thereom Q (1 Viewer)

[flon]

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

 

[lolokay]

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

 

[flon]

Thanks. It helped a lot. Well done.