Whakaoti i te C(x)=2400-40x+2x^2

$$C ( x ) = 2400 - 40 x + 2 x ^ { 2 }$$

Tauwehe

$$2\left(x^{2}-20x+1200\right)$$

Ngā Upane Otinga

Tauwehea te 2. Kāore te pūrau 1200-20x+x^{2} i whakatauwehea i te mea kāhore ōna pūtake whakahau.

$$2\left(1200-20x+x^{2}\right)$$

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.

$$2x^{2}-40x+2400=0$$

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.

$$x=\frac{-\left(-40\right)±\sqrt{\left(-40\right)^{2}-4\times 2\times 2400}}{2\times 2}$$

Pūrua -40.

$$x=\frac{-\left(-40\right)±\sqrt{1600-4\times 2\times 2400}}{2\times 2}$$

Whakareatia -4 ki te 2.

$$x=\frac{-\left(-40\right)±\sqrt{1600-8\times 2400}}{2\times 2}$$

Whakareatia -8 ki te 2400.

$$x=\frac{-\left(-40\right)±\sqrt{1600-19200}}{2\times 2}$$

Tāpiri 1600 ki te -19200.

$$x=\frac{-\left(-40\right)±\sqrt{-17600}}{2\times 2}$$

Tā te mea e kore te pūrua o tētahi tau tōraro e tautohutia ki te āpure tūturu, kāhore he rongoā. Kāore e taea te pūrau pūrua te whakatauwehe.

$$2x^{2}-40x+2400$$

Aromātai

$$2\left(x^{2}-20x+1200\right)$$