Whakaoti i te f(x)=3x^2-7x+23,text{when}x=-2

$$f ( x ) = 3 x ^ { 2 } - 7 x + 23 , \text { when } x = - 2$$

Whakaoti mō f, x

$$x=-2$$

$$f = -\frac{49}{2} = -24\frac{1}{2} = -24.5$$

Ngā Upane Otinga

Whakaarohia te whārite tuatahi. Me kōkuhu ngā uara tāupe mōhiotia ki te whārite.

$$f\left(-2\right)=3\left(-2\right)^{2}-7\left(-2\right)+23$$

Tātaihia te -2 mā te pū o 2, kia riro ko 4.

$$f\left(-2\right)=3\times 4-7\left(-2\right)+23$$

Whakareatia te 3 ki te 4, ka 12.

$$f\left(-2\right)=12-7\left(-2\right)+23$$

Whakareatia te -7 ki te -2, ka 14.

$$f\left(-2\right)=12+14+23$$

Tāpirihia te 12 ki te 14, ka 26.

$$f\left(-2\right)=26+23$$

Tāpirihia te 26 ki te 23, ka 49.

$$f\left(-2\right)=49$$

Whakawehea ngā taha e rua ki te -2.

$$f=-\frac{49}{2}$$

Kua oti te pūnaha te whakatau.

$$f=-\frac{49}{2} x=-2$$