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Kimi Pārōnaki e ai ki x
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2x-5x^{3}\times 2-3
Hei whakarea i ngā pū o te pūtake kotahi, me tāpiri ō rātou taupū. Tāpiria te 2 me te 1 kia riro ai te 3.
2x-10x^{3}-3
Whakareatia te 5 ki te 2, ka 10.
2x^{1-1}+2\left(-10x\right)x^{2-1}
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}.
2x^{0}+2\left(-10x\right)x^{2-1}
Tango 1 mai i 1.
2x^{0}+\left(-20x\right)x^{2-1}
Whakareatia 2 ki te -5\times 2x.
2x^{0}+\left(-20x\right)x^{1}
Tango 1 mai i 2.
2x^{0}+\left(-20x\right)x
Mō tētahi kupu t, t^{1}=t.
2\times 1+\left(-20x\right)x
Mō tētahi kupu t mahue te 0, t^{0}=1.
2+\left(-20x\right)x
Mō tētahi kupu t, t\times 1=t me 1t=t.