How do you factor #36-1/9r^2#?
1 Answer
Jul 24, 2018
Explanation:
#"take out a "color(blue)"common factor "1/9#
#=1/9(324-r^2)#
#324-r^2" is a "color(blue)"difference of squares"#
#•color(white)(x)a^2-b^2=(a-b)(a+b)#
#"here "a=sqrt324=18" and "b=r#
#36-1/9r^2=1/9(18-r)(18+r)#
