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\frac{400x^{2}+40x+1}{25}
Tauwehea te \frac{1}{25}.
\left(20x+1\right)^{2}
Whakaarohia te 400x^{2}+40x+1. Whakamahia te tikanga tātai pūrua pā, a^{2}+2ab+b^{2}=\left(a+b\right)^{2}, ina a=20x, ina b=1.
\frac{\left(20x+1\right)^{2}}{25}
Me tuhi anō te kīanga whakatauwehe katoa.