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7\left(y^{4}+4y^{3}-5\right)
Tauwehea te 7.
\left(y-1\right)\left(y^{3}+5y^{2}+5y+5\right)
Whakaarohia te y^{4}+4y^{3}-5. Tā te Rational Root Theorem, ko ngā pūtake whakahau katoa o tētahi pūrau kei te āhua o \frac{p}{q}, ina wehea e p te kīanga pūmau -5, ā, ka wehea e q te whakarea arahanga 1. Ko tetahi pūtake pērā ko 1. Tauwehea te pūrau mā te whakawehe mā te y-1.
7\left(y-1\right)\left(y^{3}+5y^{2}+5y+5\right)
Me tuhi anō te kīanga whakatauwehe katoa. Kāore te pūrau y^{3}+5y^{2}+5y+5 i whakatauwehea i te mea kāhore ōna pūtake whakahau.