Question

If a-b=2 and ab=3, then a3-b3

Answer 1

Answer:

Step-by-step explanation:

(a - b)³ = a³ -3a²b  + 3ab² -b³

(2)³ = a³ - b³ - 3ab ( a - b )

8 = a³ - b³ - 3 (3)(2)

8 = a³ - b³ - 18

a³ - b³ = 28

Answer 2

Answer:

26.

a - b = 2

☞ a = 2+b

ab = 3

☞ (2+b) (b) = 3

☞ b² + 2b - 3 = 0

By solving the above equation,

we get, b = 1 or -3

if b=1

a= 3

a³ - b³ = 3³ - 1³

= 27 - 1

= 26.

b ≠ -3 b'coz it doesn't satisfies given conditions of a & b.

please mark it as brainliest answer!!