Whakaoti i te f(n)-f(n-1)=15text{and}f(1)=4W

$$f ( n ) - f ( n - 1 ) = 15 \text { and } f ( 1 ) = 4 W$$

Whakaoti mō f, n, W

$$f=15$$

$$n\in \mathrm{R}$$

$$W = \frac{15}{4} = 3\frac{3}{4} = 3.75$$

Ngā Upane Otinga

Whakaarohia te whārite tuatahi. Whakamahia te āhuatanga tohatoha hei whakarea te f ki te n-1.

$$fn-\left(fn-f\right)=15$$

Hei kimi i te tauaro o fn-f, kimihia te tauaro o ia taurangi.

$$fn-fn+f=15$$

Pahekotia te fn me -fn, ka 0.

$$f=15$$

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

$$15\times 1=4W$$

Whakareatia te 15 ki te 1, ka 15.

$$15=4W$$

Whakawhitihia ngā taha kia puta ki te taha mauī ngā kīanga tau taurangi katoa.

$$4W=15$$

Whakawehea ngā taha e rua ki te 4.

$$W=\frac{15}{4}$$

Kua oti te pūnaha te whakatau.

$$f=15 W=\frac{15}{4}$$