Question

please help me---- fast .........

Answer 1

2 a - 3b = 5

use the identity (a-b)^3 and prove it

Answer 2

Answer:

Step-by-step explanation:

2a-3b=5

so,

(2a-3b)³=5³

(2a)³-(3b)³-3(2a)(3b)(2a-3b)=125

8a³-27b³-18ab(2a-3b)=125

8a³-27b³-18ab×(5)=125                               (as 2a-3b=5)

8a³-27b³-90ab=125

hence proved