Whakaoti i te x^2+14x+49=0

$${ x }^{ 2 } +14x+49=0$$

Whakaoti mō x

$$x=-7$$

Ngā Upane Whakamahi Tauwehe

Hei whakaoti i te whārite, whakatauwehea te x^{2}+14x+49 mā te whakamahi i te tātai x^{2}+\left(a+b\right)x+ab=\left(x+a\right)\left(x+b\right). Hei kimi a me b, whakaritea tētahi pūnaha kia whakaoti.

$$a+b=14 ab=49$$

I te mea kua tōrunga te ab, he ōrite te tohu o a me b. I te mea kua tōrunga te a+b, he tōrunga hoki a a me b. Whakarārangitia ngā tau tōpū takirua pērā katoa ka hoatu i te hua 49.

$$1,49 7,7$$

Tātaihia te tapeke mō ia takirua.

$$1+49=50 7+7=14$$

Ko te otinga te takirua ka hoatu i te tapeke 14.

$$a=7 b=7$$

Me tuhi anō te kīanga whakatauwehe \left(x+a\right)\left(x+b\right) mā ngā uara i tātaihia.

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

Tuhia anōtia hei pūrua huarua.

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

Hei kimi i te otinga whārite, whakaotia te x+7=0.

$$x=-7$$

Ngā Upane Whakamahi Tauwehe Mā te Whakarōpū

Hei whakaoti i te whārite, whakatauwehea te taha mauī mā te whakarōpū. Tuatahi, me tuhi anō te taha mauī hei x^{2}+ax+bx+49. Hei kimi a me b, whakaritea tētahi pūnaha kia whakaoti.

$$a+b=14 ab=1\times 49=49$$

I te mea kua tōrunga te ab, he ōrite te tohu o a me b. I te mea kua tōrunga te a+b, he tōrunga hoki a a me b. Whakarārangitia ngā tau tōpū takirua pērā katoa ka hoatu i te hua 49.

$$1,49 7,7$$

Tātaihia te tapeke mō ia takirua.

$$1+49=50 7+7=14$$

Ko te otinga te takirua ka hoatu i te tapeke 14.

$$a=7 b=7$$

Tuhia anō te x^{2}+14x+49 hei \left(x^{2}+7x\right)+\left(7x+49\right).

$$\left(x^{2}+7x\right)+\left(7x+49\right)$$

Tauwehea te x i te tuatahi me te 7 i te rōpū tuarua.

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

Whakatauwehea atu te kīanga pātahi x+7 mā te whakamahi i te āhuatanga tātai tohatoha.

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

Tuhia anōtia hei pūrua huarua.

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

Hei kimi i te otinga whārite, whakaotia te x+7=0.

$$x=-7$$

Ngā Upane e Whakamahi ana i te Tikanga Tātai Pūrua

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.

$$x^{2}+14x+49=0$$

Kei te āhua arowhānui tēnei whārite: ax^{2}+bx+c=0. Me whakakapi 1 mō a, 14 mō b, me 49 mō c i te tikanga tātai pūrua, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.

$$x=\frac{-14±\sqrt{14^{2}-4\times 49}}{2}$$

Pūrua 14.

$$x=\frac{-14±\sqrt{196-4\times 49}}{2}$$

Whakareatia -4 ki te 49.

$$x=\frac{-14±\sqrt{196-196}}{2}$$

Tāpiri 196 ki te -196.

$$x=\frac{-14±\sqrt{0}}{2}$$

Tuhia te pūtakerua o te 0.

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

Whakawehe -14 ki te 2.

$$x=-7$$

Ngā Upane mō te Whakaoti i te Pūrua

Tauwehea x^{2}+14x+49. Ko te tikanga pūnoa, ina ko x^{2}+bx+c he pūrua tika pūrua tika pū, ka taea taua mea te tauwehea i ngā wā katoa hei \left(x+\frac{b}{2}\right)^{2}.

$$\left(x+7\right)^{2}=0$$

Tuhia te pūtakerua o ngā taha e rua o te whārite.

$$\sqrt{\left(x+7\right)^{2}}=\sqrt{0}$$

Whakarūnātia.

$$x+7=0 x+7=0$$

Me tango 7 mai i ngā taha e rua o te whārite.

$$x=-7 x=-7$$

Kua oti te whārite te whakatau. He ōrite ngā whakatau.

$$x=-7$$