How do you factor 36-1/9r^2?

1 Answer
Jim G.
Jul 24, 2018

1/9(18-r)(18+r)

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)

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