factor 27x^3-8y^3

Please help me solve, im studying for a placement test.
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2 Answers

27x^3-8y^3=(3x)^3-(2y)^3=(3x-2y)(9x^2+6xy+4y^2)

http://www.purplemath.com/modules/specfact2.htm

by Level 8 User (35.3k points)
x^2+y^2=(x+y)^2-2xy
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