f(a+2)=a+2^3-2(a+2^2)+(a+2)-9 eching

$$f ( a + 2 ) = a + 2 ^ { 3 } - 2 ( a + 2 ^ { 2 } ) + ( a + 2 ) - 9$$

Baholash

$$-7$$

Yechim qadamlari

3 daraja ko‘rsatkichini 2 ga hisoblang va 8 ni qiymatni oling.

$$a+8-2\left(a+2^{2}\right)+a+2-9$$

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

$$a+8-2\left(a+4\right)+a+2-9$$

-2 ga a+4 ni ko'paytirish orqali distributiv xususiyatdan foydalanish.

$$a+8-2a-8+a+2-9$$

-a ni olish uchun a va -2a ni birlashtirish.

$$-a+8-8+a+2-9$$

0 olish uchun 8 dan 8 ni ayirish.

$$-a+a+2-9$$

-7 olish uchun 2 dan 9 ni ayirish.

$$-a+a-7$$

0 ni olish uchun -a va a ni birlashtirish.

$$-7$$

Omil

$$-7$$