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Tohaina

b\left(a^{2}-4a+4\right)
Tauwehea te b.
\left(a-2\right)^{2}
Whakaarohia te a^{2}-4a+4. Whakamahia te tikanga tātai pūrua pā, p^{2}-2pq+q^{2}=\left(p-q\right)^{2}, ina p=a, ina q=2.
b\left(a-2\right)^{2}
Me tuhi anō te kīanga whakatauwehe katoa.