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Whakaroha
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Tohaina

8y^{3}-12y^{2}+6y-1-3\left(2y-1\right)^{2}
Whakamahia te ture huarua \left(a-b\right)^{3}=a^{3}-3a^{2}b+3ab^{2}-b^{3} hei whakaroha \left(2y-1\right)^{3}.
8y^{3}-12y^{2}+6y-1-3\left(4y^{2}-4y+1\right)
Whakamahia te ture huarua \left(a-b\right)^{2}=a^{2}-2ab+b^{2} hei whakaroha \left(2y-1\right)^{2}.
8y^{3}-12y^{2}+6y-1-12y^{2}+12y-3
Whakamahia te āhuatanga tohatoha hei whakarea te -3 ki te 4y^{2}-4y+1.
8y^{3}-24y^{2}+6y-1+12y-3
Pahekotia te -12y^{2} me -12y^{2}, ka -24y^{2}.
8y^{3}-24y^{2}+18y-1-3
Pahekotia te 6y me 12y, ka 18y.
8y^{3}-24y^{2}+18y-4
Tangohia te 3 i te -1, ka -4.
8y^{3}-12y^{2}+6y-1-3\left(2y-1\right)^{2}
Whakamahia te ture huarua \left(a-b\right)^{3}=a^{3}-3a^{2}b+3ab^{2}-b^{3} hei whakaroha \left(2y-1\right)^{3}.
8y^{3}-12y^{2}+6y-1-3\left(4y^{2}-4y+1\right)
Whakamahia te ture huarua \left(a-b\right)^{2}=a^{2}-2ab+b^{2} hei whakaroha \left(2y-1\right)^{2}.
8y^{3}-12y^{2}+6y-1-12y^{2}+12y-3
Whakamahia te āhuatanga tohatoha hei whakarea te -3 ki te 4y^{2}-4y+1.
8y^{3}-24y^{2}+6y-1+12y-3
Pahekotia te -12y^{2} me -12y^{2}, ka -24y^{2}.
8y^{3}-24y^{2}+18y-1-3
Pahekotia te 6y me 12y, ka 18y.
8y^{3}-24y^{2}+18y-4
Tangohia te 3 i te -1, ka -4.