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Whakaoti mō y
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Whakaoti mō x (complex solution)
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Whakaoti mō x
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Tohaina

y=x^{2}+6x+9-4
Whakamahia te ture huarua \left(a+b\right)^{2}=a^{2}+2ab+b^{2} hei whakaroha \left(x+3\right)^{2}.
y=x^{2}+6x+5
Tangohia te 4 i te 9, ka 5.