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Whakaroha
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Tohaina

8a^{3}-12a^{2}+6a-1-27+a^{3}
Whakamahia te ture huarua \left(p-q\right)^{3}=p^{3}-3p^{2}q+3pq^{2}-q^{3} hei whakaroha \left(2a-1\right)^{3}.
8a^{3}-12a^{2}+6a-28+a^{3}
Tangohia te 27 i te -1, ka -28.
9a^{3}-12a^{2}+6a-28
Pahekotia te 8a^{3} me a^{3}, ka 9a^{3}.
8a^{3}-12a^{2}+6a-1-27+a^{3}
Whakamahia te ture huarua \left(p-q\right)^{3}=p^{3}-3p^{2}q+3pq^{2}-q^{3} hei whakaroha \left(2a-1\right)^{3}.
8a^{3}-12a^{2}+6a-28+a^{3}
Tangohia te 27 i te -1, ka -28.
9a^{3}-12a^{2}+6a-28
Pahekotia te 8a^{3} me a^{3}, ka 9a^{3}.