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• r³-6r²+12r-8 You can rewrite this as r³-3*2r²+3r(2)²-(2)³ and comparing this to (a-b)³ = a³-3a²b + 3b²a - b³ you see that here a = r and b= 2, and r³-6r²+12r-8 = r³-3*2r²+3r(2)²-(2)³ = (r-2)³ Or Rearrange r³-6r²+…

  in How do you factor: r^3 - 6r^2 + 12r - 8? Comment by andrew-wilson_60b039812fee7 May 2021