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Whakaroha
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Tohaina

\left(-z\right)^{2}-20\left(-z\right)+100
Whakamahia te ture huarua \left(a-b\right)^{2}=a^{2}-2ab+b^{2} hei whakaroha \left(-z-10\right)^{2}.
z^{2}-20\left(-z\right)+100
Tātaihia te -z mā te pū o 2, kia riro ko z^{2}.
z^{2}+20z+100
Whakareatia te -20 ki te -1, ka 20.
\left(-z\right)^{2}-20\left(-z\right)+100
Whakamahia te ture huarua \left(a-b\right)^{2}=a^{2}-2ab+b^{2} hei whakaroha \left(-z-10\right)^{2}.
z^{2}-20\left(-z\right)+100
Tātaihia te -z mā te pū o 2, kia riro ko z^{2}.
z^{2}+20z+100
Whakareatia te -20 ki te -1, ka 20.