f(x)=-x^2+8x-2 eching

$$f ( x ) = - x ^ { 2 } + 8 x - 2$$

Omil

$$-\left(x-\left(4-\sqrt{14}\right)\right)\left(x-\left(\sqrt{14}+4\right)\right)$$

Kvadrat tenglamalaridan foydalanish qoidalari

Kvadrat koʻp tenglama bu orqali hisoblanadi: ax^{2}+bx+c=a\left(x-x_{1}\right)\left(x-x_{2}\right), bu yerda x_{1} va x_{2} ax^{2}+bx+c=0 kvadrat tenglamaning yechimlari.

$$-x^{2}+8x-2=0$$

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.

$$x=\frac{-8±\sqrt{8^{2}-4\left(-1\right)\left(-2\right)}}{2\left(-1\right)}$$

8 kvadratini chiqarish.

$$x=\frac{-8±\sqrt{64-4\left(-1\right)\left(-2\right)}}{2\left(-1\right)}$$

-4 ni -1 marotabaga ko'paytirish.

$$x=\frac{-8±\sqrt{64+4\left(-2\right)}}{2\left(-1\right)}$$

4 ni -2 marotabaga ko'paytirish.

$$x=\frac{-8±\sqrt{64-8}}{2\left(-1\right)}$$

64 ni -8 ga qo'shish.

$$x=\frac{-8±\sqrt{56}}{2\left(-1\right)}$$

56 ning kvadrat ildizini chiqarish.

$$x=\frac{-8±2\sqrt{14}}{2\left(-1\right)}$$

2 ni -1 marotabaga ko'paytirish.

$$x=\frac{-8±2\sqrt{14}}{-2}$$

x=\frac{-8±2\sqrt{14}}{-2} tenglamasini yeching, bunda ± musbat. -8 ni 2\sqrt{14} ga qo'shish.

$$x=\frac{2\sqrt{14}-8}{-2}$$

-8+2\sqrt{14} ni -2 ga bo'lish.

$$x=4-\sqrt{14}$$

x=\frac{-8±2\sqrt{14}}{-2} tenglamasini yeching, bunda ± manfiy. -8 dan 2\sqrt{14} ni ayirish.

$$x=\frac{-2\sqrt{14}-8}{-2}$$

-8-2\sqrt{14} ni -2 ga bo'lish.

$$x=\sqrt{14}+4$$

ax^{2}+bx+c=a\left(x-x_{1}\right)\left(x-x_{2}\right) formulasi yordamida amalni hisoblang. x_{1} uchun 4-\sqrt{14} ga va x_{2} uchun 4+\sqrt{14} ga bo‘ling.

$$-x^{2}+8x-2=-\left(x-\left(4-\sqrt{14}\right)\right)\left(x-\left(\sqrt{14}+4\right)\right)$$

Baholash

$$-x^{2}+8x-2$$