Question

If a/b +b/a = -1 then ( a³ - b³ ) is ​

Answer 1

Answer:

a³ – b³ = 56

⇒ (a – b)³ + 3ab (a – b) = 56

⇒ (2)³ + 3ab × 2 = 56

⇒ 6ab = 56 – 8 = 48

⇒ ab = 48 ÷ 6 = 8

∴ a² + b² = (a – b)² + 2ab

= 2²+ 2 × 8

= 4 + 16 = 20

Answer 2

Answer:

anser 20

Step-by-step explanation:

you can see above answer is 20