How do you factor #6m^3+15m² - 2m - 5#?
1 Answer
Jul 31, 2016
Explanation:
Group the terms into 'pairs' as shown.
#[6m^3+15m^2]+[-2m-5]# now factorise each 'pair'
#rArrcolor(red)(3m^2)(2m+5)color(red)(-1)(2m+5)# there is now a common factor of (2m + 5) which can be taken out.
#(2m+5)color(red)((3m^2-1))#
#rArr6m^3+15m^2-2m-5=(2m+5)(3m^2-1)#
