How do you factor r^3-8?

2 Answers
May 21, 2018

(r-2)(r^2 + 2r + 4)

Explanation:

Difference of Cubes follows the formula:
a^3 - b^3 = (a-b)(a^2 + ab + b^2)

r^3 - 8 = r^3 - 2^3 = (r-2)(r^2 + 2r + 4)

May 21, 2018

(r-2)(r^2+2r+4)

Explanation:

"this is a "color(blue)"difference of cubes"

"which factors in general as"

•color(white)(x)a^3-b^3=(a-b)(a^2+ab+b^2)

"here "a=r" and "b=2

rArrr^3-8=(r-2)(r^2+2r+4)