# How do you factor by grouping #63n^3 + 54n^2 - 105n - 90#?

##### 1 Answer

May 10, 2018

#### Explanation:

#"take out a "color(blue)"common factor "3#

#=3(21n^3+18n^2-35n-30)#

#=3(color(red)(3n^2)(7n+6)color(red)(-5)(3n+6))#

#=3((7n+6)(color(red)(3n^2-5)))#

#=3(7n+6)(3n^2-5)#