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Tohaina

x\left(x^{3}+5x-4x^{2}-20\right)
Tauwehea te x.
x\left(x^{2}+5\right)-4\left(x^{2}+5\right)
Whakaarohia te x^{3}+5x-4x^{2}-20. Mahia te whakarōpūtanga x^{3}+5x-4x^{2}-20=\left(x^{3}+5x\right)+\left(-4x^{2}-20\right), ka whakatauwehea atu x i te tuatahi me -4 i te rōpū tuarua.
\left(x^{2}+5\right)\left(x-4\right)
Whakatauwehea atu te kīanga pātahi x^{2}+5 mā te whakamahi i te āhuatanga tātai tohatoha.
x\left(x^{2}+5\right)\left(x-4\right)
Me tuhi anō te kīanga whakatauwehe katoa. Kāore te pūrau x^{2}+5 i whakatauwehea i te mea kāhore ōna pūtake whakahau.