Whakaoti i te 4k^2-4k-3

$$4 k ^ { 2 } - 4 k - 3$$

Tauwehe

$$\left(2k-3\right)\left(2k+1\right)$$

Ngā Upane Otinga

Whakatauwehea te kīanga mā te whakarōpū. Tuatahi, me tuhi anō te kīanga hei 4k^{2}+ak+bk-3. Hei kimi a me b, whakaritea tētahi pūnaha kia whakaoti.

$$a+b=-4 ab=4\left(-3\right)=-12$$

I te mea kua tōraro te ab, he tauaro ngā tohu o a me b. I te mea kua tōraro te a+b, he nui ake te uara pū o te tau tōraro i tō te tōrunga. Whakarārangitia ngā tau tōpū takirua pērā katoa ka hoatu i te hua -12.

$$1,-12 2,-6 3,-4$$

Tātaihia te tapeke mō ia takirua.

$$1-12=-11 2-6=-4 3-4=-1$$

Ko te otinga te takirua ka hoatu i te tapeke -4.

$$a=-6 b=2$$

Tuhia anō te 4k^{2}-4k-3 hei \left(4k^{2}-6k\right)+\left(2k-3\right).

$$\left(4k^{2}-6k\right)+\left(2k-3\right)$$

Whakatauwehea atu 2k i te 4k^{2}-6k.

$$2k\left(2k-3\right)+2k-3$$

Whakatauwehea atu te kīanga pātahi 2k-3 mā te whakamahi i te āhuatanga tātai tohatoha.

$$\left(2k-3\right)\left(2k+1\right)$$

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.

$$4k^{2}-4k-3=0$$

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.

$$k=\frac{-\left(-4\right)±\sqrt{\left(-4\right)^{2}-4\times 4\left(-3\right)}}{2\times 4}$$

Pūrua -4.

$$k=\frac{-\left(-4\right)±\sqrt{16-4\times 4\left(-3\right)}}{2\times 4}$$

Whakareatia -4 ki te 4.

$$k=\frac{-\left(-4\right)±\sqrt{16-16\left(-3\right)}}{2\times 4}$$

Whakareatia -16 ki te -3.

$$k=\frac{-\left(-4\right)±\sqrt{16+48}}{2\times 4}$$

Tāpiri 16 ki te 48.

$$k=\frac{-\left(-4\right)±\sqrt{64}}{2\times 4}$$

Tuhia te pūtakerua o te 64.

$$k=\frac{-\left(-4\right)±8}{2\times 4}$$

Ko te tauaro o -4 ko 4.

$$k=\frac{4±8}{2\times 4}$$

Whakareatia 2 ki te 4.

$$k=\frac{4±8}{8}$$

Nā, me whakaoti te whārite k=\frac{4±8}{8} ina he tāpiri te ±. Tāpiri 4 ki te 8.

$$k=\frac{12}{8}$$

Whakahekea te hautanga \frac{12}{8} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 4.

$$k=\frac{3}{2}$$

Nā, me whakaoti te whārite k=\frac{4±8}{8} ina he tango te ±. Tango 8 mai i 4.

$$k=-\frac{4}{8}$$

Whakahekea te hautanga \frac{-4}{8} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 4.

$$k=-\frac{1}{2}$$

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 \frac{3}{2} mō te x_{1} me te -\frac{1}{2} mō te x_{2}.

$$4k^{2}-4k-3=4\left(k-\frac{3}{2}\right)\left(k-\left(-\frac{1}{2}\right)\right)$$

Whakamāmātia ngā kīanga katoa o te āhua p-\left(-q\right) ki te p+q.

$$4k^{2}-4k-3=4\left(k-\frac{3}{2}\right)\left(k+\frac{1}{2}\right)$$

Tango \frac{3}{2} mai i k mā te kimi i te tauraro pātahi me te tango i ngā taurunga, ka whakaiti i te hautanga ki ngā kīanga tau iti rawa e taea ana.

$$4k^{2}-4k-3=4\times \frac{2k-3}{2}\left(k+\frac{1}{2}\right)$$

Tāpiri \frac{1}{2} ki te k mā te kimi i te tauraro pātahi me te tāpiri i ngā taurunga. Ka whakaiti i te hautanga ki ngā kīanga tau iti rawa e taea ana.

$$4k^{2}-4k-3=4\times \frac{2k-3}{2}\times \frac{2k+1}{2}$$

Whakareatia \frac{2k-3}{2} ki te \frac{2k+1}{2} mā te whakarea taurunga ki te taurunga me te tauraro ki te tauraro, ka whakaiti i te hautanga ki ngā kīanga tau iti rawa e taea ana.

$$4k^{2}-4k-3=4\times \frac{\left(2k-3\right)\left(2k+1\right)}{2\times 2}$$

Whakareatia 2 ki te 2.

$$4k^{2}-4k-3=4\times \frac{\left(2k-3\right)\left(2k+1\right)}{4}$$

Whakakorea atu te tauwehe pūnoa nui rawa 4 i roto i te 4 me te 4.

$$4k^{2}-4k-3=\left(2k-3\right)\left(2k+1\right)$$

Aromātai

$$\left(2k-3\right)\left(2k+1\right)$$