Question

Solve using suitable identity:(20)^3/[(-13)^3+(-7)^3]

Answer 1

Answer:

- 3.1496

Explanation:

(-13)^3 = -2197

(-7)^3 = -343

[(-13)^3 + (-7)^3] = -2540

(20)^3 = 8000

(20)^3/[(-13)^3 + (-7)^3] = 8000/(-2540)

                                     =  - 3.1496