Question

Find the mean of (a+b),a-b),(a^2+b^2)(a^2-b^2),(a^3+b^3),(a^3-b^3)​

Answer 1

Answer:

What is the formula of a3+b3 ?

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

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(a + b)2 = a2 + 2ab+ b2

2. (a - b)2 = a2 - 2ab+ b2

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

4. (a - b)3 = a3 - b3 - 3ab(a - b)

5. (a + b + c)2 = a2 + b2 + c2 +2ab+2bc +2ca

. 6 .(a + b + c)3 = a3 + b3 + c3+3a2 b+3a2 c + 3b2 c +3b2 a +3c2 a +3c2 a+6abc

7. a2 - b2 = (a + b)(a – b )

8. a3 – b3 = (a – b) (a2 + ab + b2 )

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

10 .(a + b)2 + (a - b)2 = 4ab

11. (a + b)2 - (a - b)2 = 2(a2 + b2 )

12. If a + b +c =0, then a3 + b3 + c3 = 3 abc