f(x)=3x^2-7x+23text{when}x=-2? eching

$$f ( x ) = 3 x ^ { 2 } - 7 x + 23 \text { when } x = - 2 ?$$

f, x uchun yechish

$$x=-2$$

$$f = -\frac{49}{2} = -24\frac{1}{2} = -24,5$$

Yechim qadamlari

Birinchi tenglamani yeching. Tenglamaga o‘zgaruvchining ma’lum qiymatlarini joylang.

$$f\left(-2\right)=3\left(-2\right)^{2}-7\left(-2\right)+23$$

2 daraja ko‘rsatkichini -2 ga hisoblang va 4 ni qiymatni oling.

$$f\left(-2\right)=3\times 4-7\left(-2\right)+23$$

12 hosil qilish uchun 3 va 4 ni ko'paytirish.

$$f\left(-2\right)=12-7\left(-2\right)+23$$

14 hosil qilish uchun -7 va -2 ni ko'paytirish.

$$f\left(-2\right)=12+14+23$$

26 olish uchun 12 va 14'ni qo'shing.

$$f\left(-2\right)=26+23$$

49 olish uchun 26 va 23'ni qo'shing.

$$f\left(-2\right)=49$$

Ikki tarafini -2 ga bo‘ling.

$$f=-\frac{49}{2}$$

Tizim hal qilindi.

$$f=-\frac{49}{2} x=-2$$