Question

1) (a+b)^ 3 = a^3 + 3a^2b + 3ab^2 + b^3.

2)(a+b)^3 = a^3 + b^3 + 3ab(a+b).

3)(a-b)^3 = a^3 - 3a^2b + 3ab^2 - b^3.

4)(a-b)^3 = a^3 - b^3 - 3ab(a-b).

with the help of the said formulas , solve the following questions:.

(1)2a - 2/a + 1 = 0, calculate the value of a^3 - 1/a^3 +2 (ans):3/8.

(2) if m+n = 5 and mn=6, find out the value of. (m^2 + n^2)(m^3 + n^3). (ans:455) ​

Answer 1

see in attachment mate❣❣