Whakaoti i te 7x-x^2

$$7 x - x ^ { 2 }$$

Tauwehe

$$x\left(7-x\right)$$

Ngā Upane Otinga

Tauwehea te x.

$$x\left(7-x\right)$$

Ngā Upane e Whakamahi ana i te Tikanga Tātai Pūrua

Ka taea te huamaha pūrua te tauwehe mā te whakamahi i te huringa ax^{2}+bx+c=a\left(x-x_{1}\right)\left(x-x_{2}\right), ina ko x_{1} me x_{2} ngā otinga o te whārite pūrua ax^{2}+bx+c=0.

$$-x^{2}+7x=0$$

Ko ngā whārite katoa o te āhua ax^{2}+bx+c=0 ka taea te whakaoti mā te whakamahi i te tikanga tātai pūrua: \frac{-b±\sqrt{b^{2}-4ac}}{2a}. E rua ngā otinga ka puta i te tikanga tātai pūrua, ko tētahi ina he tāpiri a ±, ā, ko tētahi ina he tango.

$$x=\frac{-7±\sqrt{7^{2}}}{2\left(-1\right)}$$

Tuhia te pūtakerua o te 7^{2}.

$$x=\frac{-7±7}{2\left(-1\right)}$$

Whakareatia 2 ki te -1.

$$x=\frac{-7±7}{-2}$$

Nā, me whakaoti te whārite x=\frac{-7±7}{-2} ina he tāpiri te ±. Tāpiri -7 ki te 7.

$$x=\frac{0}{-2}$$

Whakawehe 0 ki te -2.

$$x=0$$

Nā, me whakaoti te whārite x=\frac{-7±7}{-2} ina he tango te ±. Tango 7 mai i -7.

$$x=-\frac{14}{-2}$$

Whakawehe -14 ki te -2.

$$x=7$$

Tauwehea te kīanga taketake mā te whakamahi i te ax^{2}+bx+c=a\left(x-x_{1}\right)\left(x-x_{2}\right). Me whakakapi te 0 mō te x_{1} me te 7 mō te x_{2}.

$$-x^{2}+7x=-x\left(x-7\right)$$

Aromātai

$$x\left(7-x\right)$$