x^2+2x-12=0 eching

$$x ^ { 2 } + 2 x - 12 = 0$$

x uchun yechish (complex solution)

$$x=\sqrt{13}-1\approx 2,605551275$$

$$x=-\left(\sqrt{13}+1\right)\approx -4,605551275$$

Kvadrat tenglamalaridan foydalanish qoidalari

ax^{2}+bx+c=0 shaklidagi barcha tenglamalarni kvadrat formulasi bilan yechish mumkin: \frac{-b±\sqrt{b^{2}-4ac}}{2a}. Kvadrat formula ikki yechmni taqdim qiladi, biri ± qo'shish bo'lganda, va ikkinchisi ayiruv bo'lganda.

$$x^{2}+2x-12=0$$

Ushbu tenglama standart shaklidadir: ax^{2}+bx+c=0. Kvadrat tenglama formulasida, \frac{-b±\sqrt{b^{2}-4ac}}{2a} 1 ni a, 2 ni b va -12 ni c bilan almashtiring.

$$x=\frac{-2±\sqrt{2^{2}-4\left(-12\right)}}{2}$$

2 kvadratini chiqarish.

$$x=\frac{-2±\sqrt{4-4\left(-12\right)}}{2}$$

-4 ni -12 marotabaga ko'paytirish.

$$x=\frac{-2±\sqrt{4+48}}{2}$$

4 ni 48 ga qo'shish.

$$x=\frac{-2±\sqrt{52}}{2}$$

52 ning kvadrat ildizini chiqarish.

$$x=\frac{-2±2\sqrt{13}}{2}$$

x=\frac{-2±2\sqrt{13}}{2} tenglamasini yeching, bunda ± musbat. -2 ni 2\sqrt{13} ga qo'shish.

$$x=\frac{2\sqrt{13}-2}{2}$$

-2+2\sqrt{13} ni 2 ga bo'lish.

$$x=\sqrt{13}-1$$

x=\frac{-2±2\sqrt{13}}{2} tenglamasini yeching, bunda ± manfiy. -2 dan 2\sqrt{13} ni ayirish.

$$x=\frac{-2\sqrt{13}-2}{2}$$

-2-2\sqrt{13} ni 2 ga bo'lish.

$$x=-\sqrt{13}-1$$

Tenglama yechildi.

$$x=\sqrt{13}-1 x=-\sqrt{13}-1$$

Kvadratni yakunlash bo'yicha qadamlar

Bu kabi kvadrat tenglamalarni kvadratni yakunlab yechish mumkin. Kvadratni yechish uchun tenglama avval ushbu shaklda bo'lishi shart: x^{2}+bx=c.

$$x^{2}+2x-12=0$$

12 ni tenglamaning ikkala tarafiga qo'shish.

$$x^{2}+2x-12-\left(-12\right)=-\left(-12\right)$$

O‘zidan -12 ayirilsa 0 qoladi.

$$x^{2}+2x=-\left(-12\right)$$

0 dan -12 ni ayirish.

$$x^{2}+2x=12$$

2 ni bo‘lish, x shartining koeffitsienti, 2 ga 1 olish uchun. Keyin, 1 ning kvadratini tenglamaning ikkala tarafiga qo‘shing. Ushbu qadam tenglamaning chap qismini mukammal kvadrat sifatida hosil qiladi.

$$x^{2}+2x+1^{2}=12+1^{2}$$

1 kvadratini chiqarish.

$$x^{2}+2x+1=12+1$$

12 ni 1 ga qo'shish.

$$x^{2}+2x+1=13$$

x^{2}+2x+1 omili. Odatda, x^{2}+bx+c mukammal kvadrat bo'lsa, u doimo \left(x+\frac{b}{2}\right)^{2} omil sifatida bo'lishi mumkin.

$$\left(x+1\right)^{2}=13$$

Tenglamaning ikkala tarafining kvadrat ildizini chiqarish.

$$\sqrt{\left(x+1\right)^{2}}=\sqrt{13}$$

Qisqartirish.

$$x+1=\sqrt{13} x+1=-\sqrt{13}$$

Tenglamaning ikkala tarafidan 1 ni ayirish.

$$x=\sqrt{13}-1 x=-\sqrt{13}-1$$

x uchun yechish

$$x=\sqrt{13}-1\approx 2,605551275$$

$$x=-\sqrt{13}-1\approx -4,605551275$$

Kvadrat tenglamalaridan foydalanish qoidalari

ax^{2}+bx+c=0 shaklidagi barcha tenglamalarni kvadrat formulasi bilan yechish mumkin: \frac{-b±\sqrt{b^{2}-4ac}}{2a}. Kvadrat formula ikki yechmni taqdim qiladi, biri ± qo'shish bo'lganda, va ikkinchisi ayiruv bo'lganda.

$$x^{2}+2x-12=0$$

Ushbu tenglama standart shaklidadir: ax^{2}+bx+c=0. Kvadrat tenglama formulasida, \frac{-b±\sqrt{b^{2}-4ac}}{2a} 1 ni a, 2 ni b va -12 ni c bilan almashtiring.

$$x=\frac{-2±\sqrt{2^{2}-4\left(-12\right)}}{2}$$

2 kvadratini chiqarish.

$$x=\frac{-2±\sqrt{4-4\left(-12\right)}}{2}$$

-4 ni -12 marotabaga ko'paytirish.

$$x=\frac{-2±\sqrt{4+48}}{2}$$

4 ni 48 ga qo'shish.

$$x=\frac{-2±\sqrt{52}}{2}$$

52 ning kvadrat ildizini chiqarish.

$$x=\frac{-2±2\sqrt{13}}{2}$$

x=\frac{-2±2\sqrt{13}}{2} tenglamasini yeching, bunda ± musbat. -2 ni 2\sqrt{13} ga qo'shish.

$$x=\frac{2\sqrt{13}-2}{2}$$

-2+2\sqrt{13} ni 2 ga bo'lish.

$$x=\sqrt{13}-1$$

x=\frac{-2±2\sqrt{13}}{2} tenglamasini yeching, bunda ± manfiy. -2 dan 2\sqrt{13} ni ayirish.

$$x=\frac{-2\sqrt{13}-2}{2}$$

-2-2\sqrt{13} ni 2 ga bo'lish.

$$x=-\sqrt{13}-1$$

Tenglama yechildi.

$$x=\sqrt{13}-1 x=-\sqrt{13}-1$$

Kvadratni yakunlash bo'yicha qadamlar

Bu kabi kvadrat tenglamalarni kvadratni yakunlab yechish mumkin. Kvadratni yechish uchun tenglama avval ushbu shaklda bo'lishi shart: x^{2}+bx=c.

$$x^{2}+2x-12=0$$

12 ni tenglamaning ikkala tarafiga qo'shish.

$$x^{2}+2x-12-\left(-12\right)=-\left(-12\right)$$

O‘zidan -12 ayirilsa 0 qoladi.

$$x^{2}+2x=-\left(-12\right)$$

0 dan -12 ni ayirish.

$$x^{2}+2x=12$$

2 ni bo‘lish, x shartining koeffitsienti, 2 ga 1 olish uchun. Keyin, 1 ning kvadratini tenglamaning ikkala tarafiga qo‘shing. Ushbu qadam tenglamaning chap qismini mukammal kvadrat sifatida hosil qiladi.

$$x^{2}+2x+1^{2}=12+1^{2}$$

1 kvadratini chiqarish.

$$x^{2}+2x+1=12+1$$

12 ni 1 ga qo'shish.

$$x^{2}+2x+1=13$$

x^{2}+2x+1 omili. Odatda, x^{2}+bx+c mukammal kvadrat bo'lsa, u doimo \left(x+\frac{b}{2}\right)^{2} omil sifatida bo'lishi mumkin.

$$\left(x+1\right)^{2}=13$$

Tenglamaning ikkala tarafining kvadrat ildizini chiqarish.

$$\sqrt{\left(x+1\right)^{2}}=\sqrt{13}$$

Qisqartirish.

$$x+1=\sqrt{13} x+1=-\sqrt{13}$$

Tenglamaning ikkala tarafidan 1 ni ayirish.

$$x=\sqrt{13}-1 x=-\sqrt{13}-1$$