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Whakaoti mō x
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Whakaoti mō y
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Tohaina

x=y^{3}+21y^{2}+147y+343
Whakamahia te ture huarua \left(a+b\right)^{3}=a^{3}+3a^{2}b+3ab^{2}+b^{3} hei whakaroha \left(y+7\right)^{3}.