Whakaoti i te x*x=391

$$x \times x=391$$

Whakaoti mō x

$$x=\sqrt{391}\approx 19.773719933$$

$$x=-\sqrt{391}\approx -19.773719933$$

Ngā Upane mā te Kimi Pūtakerua

Whakareatia te x ki te x, ka x^{2}.

$$x^{2}=391$$

Tuhia te pūtakerua o ngā taha e rua o te whārite.

$$x=\sqrt{391} x=-\sqrt{391}$$

Ngā Upane e Whakamahi ana i te Tikanga Tātai Pūrua

Whakareatia te x ki te x, ka x^{2}.

$$x^{2}=391$$

Tangohia te 391 mai i ngā taha e rua.

$$x^{2}-391=0$$

Kei te āhua arowhānui tēnei whārite: ax^{2}+bx+c=0. Me whakakapi 1 mō a, 0 mō b, me -391 mō c i te tikanga tātai pūrua, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.

$$x=\frac{0±\sqrt{0^{2}-4\left(-391\right)}}{2}$$

Pūrua 0.

$$x=\frac{0±\sqrt{-4\left(-391\right)}}{2}$$

Whakareatia -4 ki te -391.

$$x=\frac{0±\sqrt{1564}}{2}$$

Tuhia te pūtakerua o te 1564.

$$x=\frac{0±2\sqrt{391}}{2}$$

Nā, me whakaoti te whārite x=\frac{0±2\sqrt{391}}{2} ina he tāpiri te ±.

$$x=\sqrt{391}$$

Nā, me whakaoti te whārite x=\frac{0±2\sqrt{391}}{2} ina he tango te ±.

$$x=-\sqrt{391}$$

Kua oti te whārite te whakatau.

$$x=\sqrt{391} x=-\sqrt{391}$$