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Whakaoti mō y
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Whakaoti mō x
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Tohaina

y=-2\left(x^{2}+2x+1\right)-3
Whakamahia te ture huarua \left(a+b\right)^{2}=a^{2}+2ab+b^{2} hei whakaroha \left(x+1\right)^{2}.
y=-2x^{2}-4x-2-3
Whakamahia te āhuatanga tohatoha hei whakarea te -2 ki te x^{2}+2x+1.
y=-2x^{2}-4x-5
Tangohia te 3 i te -2, ka -5.