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Whakaroha
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Tohaina

2\left(p^{2}-2p+1\right)-4q\left(p-1\right)
Whakamahia te ture huarua \left(a-b\right)^{2}=a^{2}-2ab+b^{2} hei whakaroha \left(p-1\right)^{2}.
2p^{2}-4p+2-4q\left(p-1\right)
Whakamahia te āhuatanga tohatoha hei whakarea te 2 ki te p^{2}-2p+1.
2p^{2}-4p+2-4qp+4q
Whakamahia te āhuatanga tohatoha hei whakarea te -4q ki te p-1.
2\left(p^{2}-2p+1\right)-4q\left(p-1\right)
Whakamahia te ture huarua \left(a-b\right)^{2}=a^{2}-2ab+b^{2} hei whakaroha \left(p-1\right)^{2}.
2p^{2}-4p+2-4q\left(p-1\right)
Whakamahia te āhuatanga tohatoha hei whakarea te 2 ki te p^{2}-2p+1.
2p^{2}-4p+2-4qp+4q
Whakamahia te āhuatanga tohatoha hei whakarea te -4q ki te p-1.