Question

27 एक्स क्यूब प्लस बी क्यूब प्लस सी क्यूब माइनस 9 एक्स वाई जेड यूजिंग आइडेंटिटी ​

Answer 1

Answer:

bhai ye hindi me kya kya hai thik se samajh nahi aaraha hai

Answer 2

Answer:

In this section, you will learn the formula or expansion for (a3 + b3).

We already know the formula/expansion for (a + b)3.

That is,

(a + b)3 = a3 + b3 + 3ab(a + b)

Case 1 :

(a + b)3 = a3 + b3 + 3ab(a + b)

Subtract 3ab(a + b) from each side.

(a + b)3 - 3ab(a + b) = a3 + b3

Therefore, the formula for (a3 + b3) is

a3 + b3 = (a + b)3 - 3ab(a + b)

Case 2 :

From case 1,

a3 + b3 = (a + b)3 - 3ab(a + b)

a3 + b3 = (a + b)[(a + b)2 - 3ab]

a3 + b3 = (a + b)[a2 + 2ab + b2 - 3ab]

a3 + b3 = (a + b)(a2 - ab + b2)

Therefore, the formula for (a3 + b3) is

a3 + b3 = (a + b)(a2 - ab + b2)

So,

(a + b) and (a2 - ab + b2)

are the factors of (a3 + b3).