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Tohaina

3\times 6x^{3-1}+2\times 12x^{2-1}-50x^{1-1}
Ko te pārōnaki o tētahi pūrau ko te tapeke o ngā pārōnaki o ōna kīanga tau. Ko te pārōnaki o tētahi kīanga tau pūmau ko 0. Ko te pārōnaki o te ax^{n} ko te nax^{n-1}.
18x^{3-1}+2\times 12x^{2-1}-50x^{1-1}
Whakareatia 3 ki te 6.
18x^{2}+2\times 12x^{2-1}-50x^{1-1}
Tango 1 mai i 3.
18x^{2}+24x^{2-1}-50x^{1-1}
Whakareatia 2 ki te 12.
18x^{2}+24x^{1}-50x^{1-1}
Tango 1 mai i 2.
18x^{2}+24x^{1}-50x^{0}
Tango 1 mai i 1.
18x^{2}+24x-50x^{0}
Mō tētahi kupu t, t^{1}=t.
18x^{2}+24x-50
Mō tētahi kupu t mahue te 0, t^{0}=1.